start-ver=1.4 cd-journal=joma no-vol=2 cd-vols= no-issue=5 article-no= start-page=493 end-page=494 dt-received= dt-revised= dt-accepted= dt-pub-year=1986 dt-pub=1986 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Determination of Potassium in River Water by Solvent Extraction- Flow Injection Analysis en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name=IwachidoTadashi en-aut-sei=Iwachido en-aut-mei=Tadashi kn-aut-name=岩知道正 kn-aut-sei=岩知道 kn-aut-mei=正 aut-affil-num=1 ORCID= en-aut-name=OnodaMinoru en-aut-sei=Onoda en-aut-mei=Minoru kn-aut-name=小野田稔 kn-aut-sei=小野田 kn-aut-mei=稔 aut-affil-num=2 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=Potassium kn-keyword=Potassium en-keyword=4-[[4-(phenylamino)phenyl]azo]-2,5-dichlorobenzenesulfonic acid kn-keyword=4-[[4-(phenylamino)phenyl]azo]-2,5-dichlorobenzenesulfonic acid en-keyword=extraction kn-keyword=extraction en-keyword=flow injection analysis kn-keyword=flow injection analysis END start-ver=1.4 cd-journal=joma no-vol=3 cd-vols= no-issue=3 article-no= start-page=265 end-page=269 dt-received= dt-revised= dt-accepted= dt-pub-year=1987 dt-pub=19870610 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Spectrophotometric Determination of Anionic Surfactants in River Water with Cationic AZO Dye by Solvent Extraction- Flow Injection Analysis en-subtitle= kn-subtitle= en-abstract= kn-abstract=Anionic surfactants in water were determined by a spectrophotometric flow injection technique coupled with solvent extraction. The ion associate which formed between an anionic surfactant and an cationic azo dye was extracted into an organic solvent and the absorbance was measured. The carrier was distilled water, and the reagent solution contained an cationic azo dye and sodium sulfate, the pH of which being adjusted to 5 with acetate buffer. A phase separator with a poly(tetrafluoroethylene) porous membrane (0.8μm pore size) was used to separate the organic phase. Six derivatives of cationic azo dyes and several extracting solvents were examined; a pair of 1-methyl-4-(4-diethylaminophenylazo)- pyridinium cation and chloroform turned out best. The sampling rate was 30 samples per hour. Calibration graphs were linear up to 2×10(-6)M or 3×10(-5)M of anionic surfactant when injection volume was 300 or 100μl, respectively. The relative standard deviation(n=10) was 1.5% for 300μl of 1×10(-6)M sodium dodecylsulfate. The detection limit was as little as 1×10(-8)M of anionic surfactant. Anionic surfactants in river water were determined satisfactorily. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=HazakiYoshito en-aut-sei=Hazaki en-aut-mei=Yoshito kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=3 ORCID= en-aut-name=ToeiKyoji en-aut-sei=Toei en-aut-mei=Kyoji kn-aut-name=桐栄恭二 kn-aut-sei=桐栄 kn-aut-mei=恭二 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 en-keyword=Anionic surfactant determination kn-keyword=Anionic surfactant determination en-keyword=cationic azo dye kn-keyword=cationic azo dye en-keyword=ion associate extraction kn-keyword=ion associate extraction en-keyword=spectrophotometry kn-keyword=spectrophotometry en-keyword=flow injection analysis kn-keyword=flow injection analysis END start-ver=1.4 cd-journal=joma no-vol=4 cd-vols= no-issue=1 article-no= start-page=81 end-page=85 dt-received= dt-revised= dt-accepted= dt-pub-year=1988 dt-pub=19880210 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Simultaneous Determination of Sodium and Potassium Ions in River Water by Ion Chromatography Using Silica Gels as a Stationary Phase en-subtitle= kn-subtitle= en-abstract= kn-abstract=Alkali metal cations were shown to be separable on a silica gel column by cation exchange. Factors affecting the separation of these cations were investigated. Among them, type and concentration of the mobile phase electrolytes profoundly affected the retention of the analyte. The alkali metal cations were well separated on a 150 mm long Zorbax SIL column with 2.1mm i.d., using an aqueous 0.01mol dm(-3) lithium acetate as the mobile phase. Sodium and potassium in river water were determined rapidly with satisfactory accuracy. en-copyright= kn-copyright= en-aut-name=IwachidoTadashi en-aut-sei=Iwachido en-aut-mei=Tadashi kn-aut-name=岩知道正 kn-aut-sei=岩知道 kn-aut-mei=正 aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=IshimaruKenji kn-aut-sei=Ishimaru kn-aut-mei=Kenji aut-affil-num=2 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=Alkali metals kn-keyword=Alkali metals en-keyword=silica gel column kn-keyword=silica gel column en-keyword=simultaneous determination kn-keyword=simultaneous determination en-keyword=sodium kn-keyword=sodium en-keyword=potassium kn-keyword=potassium en-keyword=river water kn-keyword=river water en-keyword=ion chromatography kn-keyword=ion chromatography END start-ver=1.4 cd-journal=joma no-vol=5 cd-vols= no-issue=6 article-no= start-page=767 end-page=769 dt-received= dt-revised= dt-accepted= dt-pub-year=1989 dt-pub=19891210 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Flotation/Extraction and Spectrophotometric Determination of Silicate with Molybdate and Cationic Dyes en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=2 ORCID= en-aut-name=IkegamiTomoko en-aut-sei=Ikegami en-aut-mei=Tomoko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=Silicate determination kn-keyword=Silicate determination en-keyword=ion association complex kn-keyword=ion association complex en-keyword=heteropolyacid kn-keyword=heteropolyacid en-keyword=cationic dyes kn-keyword=cationic dyes en-keyword=flotation kn-keyword=flotation en-keyword=extraction kn-keyword=extraction END start-ver=1.4 cd-journal=joma no-vol=5 cd-vols= no-issue=2 article-no= start-page=195 end-page=200 dt-received= dt-revised= dt-accepted= dt-pub-year=1989 dt-pub=19890410 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Liquid-Liquid Distribution Behavior of Ion Association Complexes of Dihalogenocuprate(I) Anions with Azo-Dye Cations as Counter Ions en-subtitle= kn-subtitle= en-abstract= kn-abstract=The solvent extraction of ion association complexes of dihalogenocuprate(I) ions CuX(2)(-)(X-=chlorideb,r omide and iodide ions), with 4-(4-diethylaminophenylazo)-N-alkylpyridiniumc ations (azo-dye cations) is described: the alkyl groups of the azo-dye cations were methyl, ethyl and propyl groups. The extraction constants (K(ex)) for the ion association complexes of CuX(2)(-) and X(-) with these three azo-dye cations between an aqueous phase and several organic phases (chloroform, chlorobenzene, benzene and toluene) were determined. The extractabilities of CuX2 and X(-) were in the orders CuCl(2)(-)chlorobenzene>benzene>toluene. The difference in the value of log K(ex) between chloroform and chlorobenzene for CuX(2)(-) was much smaller than that for X(-) while between other solvents the differences in log K(ex) values for CuX(2)(-) and t were almost the same. From the extraction constants obtained, some possible extraction systems for a spectrophotometry for copper are predicted: they include one using chlorobenzene, the methyl derivative of the azo-dye, and iodide ion and one using chlorobenzene, the propyl derivative of the azo-dye and bromide ion. en-copyright= kn-copyright= en-aut-name=YamamotoKoichi en-aut-sei=Yamamoto en-aut-mei=Koichi kn-aut-name=山本幸市 kn-aut-sei=山本 kn-aut-mei=幸市 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=Solvent extraction kn-keyword=Solvent extraction en-keyword=copper kn-keyword=copper en-keyword=dihalogenocuprate(I)-azo dye ion association complex kn-keyword=dihalogenocuprate(I)-azo dye ion association complex en-keyword=4-(4-diethylaminophenylazo)-N-alkylpyridinium cation kn-keyword=4-(4-diethylaminophenylazo)-N-alkylpyridinium cation END start-ver=1.4 cd-journal=joma no-vol=5 cd-vols= no-issue=1 article-no= start-page=85 end-page=88 dt-received= dt-revised= dt-accepted= dt-pub-year=1989 dt-pub=19890210 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Spectrophotometric Determination of Silicate in Water with Molybdate and Malachite Green en-subtitle= kn-subtitle= en-abstract= kn-abstract=On the basis of the coloration formed with molybdosilicate and Malachite Green in aqueous solution, trace amounts of silicate were determined. In an acidic medium, silicate reacted with molybdate to form molybdosilicate, which reacted with Malachite Green to form a colored ion association complex. The color was stabilized by adding poly(vinyl alcohol). The molar absorptivity was 1.0×10(5)mol(-1)cm(-1) at 595nm, and the absorbance of the reagent blank was 0.089. The recommended concentration range of silicon was 0.1-5μg and the limit of detection was 0.01μg of silicon. Silicate in river and tap waters was determined. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=2 ORCID= en-aut-name=OjimaYuka en-aut-sei=Ojima en-aut-mei=Yuka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=Spectrophotometry kn-keyword=Spectrophotometry en-keyword=silicate determination kn-keyword=silicate determination en-keyword=molybdate kn-keyword=molybdate en-keyword=Malachite Green kn-keyword=Malachite Green en-keyword=ion association complex kn-keyword=ion association complex END start-ver=1.4 cd-journal=joma no-vol=6 cd-vols= no-issue=5 article-no= start-page=737 end-page=745 dt-received= dt-revised= dt-accepted= dt-pub-year=1990 dt-pub=19901010 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Liquid-Liquid Extraction Behavior of Inorganic and Organic Anions with Color-Changeable Neutral Extractants en-subtitle= kn-subtitle= en-abstract= kn-abstract=Color-changeable extractants for acids, acidophores, were synthesized and examined; they were 4-(N, N dimethylaminophenylazo)-pyridines and quinolines. The fundamental physicochemical constants for the acidophores and their ion associates were determined by spectrophotometry. The liquid-liquid distribution was carried out between an aqueous phase and a chloroform phase. A parameter of the extractability of the protonated cations of the acidophores and of several inorganic and organic anions as ion associates was determined on the basis of the assumption that the extraction constant of an ion association complex, log K(ex), is divided into a cationic and an anionic contributions, C and A, respectively. The order of the extractability of the anions was: Br(-)R'(4)N(+)>(C(6)H(5))(4)P(+)≈(C(6)H(5))(4)(-)As(+), and the differences in log K(ex) between the respective cations in this order averaged 1.2 and 1.1 in turn. The π values for C(6)H(5)- and C(10)H(7)(-) groups were 2.90 and 4.43, respectively. By using these empirical parameters, the extraction constants for several ion associates were estimated, and the extraction constants calculated were in good agreement with those obtained experimentally in this work and those reported by other workers. kn-abstract=1価陰イオンを対イオンとする第四級アンモニウム塩,テトラフェニルアルソニウム塩,テトラフェニルホスホニウム塩の抽出挙動考察のために,炭素数及び形状の異なる16種の陽イオンを用いて水-クロロホルム系での抽出定数を求めた.得られた抽出定数から次の知見を得た.(1) 1価無機陰イオンの抽出性は結晶イオン半径の大きいものほど良く,過塩素酸イオン>チオシアン酸イオン>ヨウ化物イオン>四フッ化ホウ素イオン>臭化物イオン>硝酸イオン>塩化物イオン>亜硝酸イオン>水酸イオン>フッ化物イオンの順となった. (2) アルキル鎖のメチルン基一つ当たりの抽出定数への寄与分は0.59(log単位)であり,フェニル基,ナフチル基の寄与分は2.90, 4.43であった. (3) 炭素数の同じ陽イオンの抽出性は, R-N(CH(3))(3)+>R'(4)N(+)>(C(6)H(5))(4)P(+)≈(C(6)H(5))(4)As+の順となった.これらの知見を基にイオン会合体の抽出定数の推定についても考察し,計算値と実測値との良い一致をみた. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=HamadaShoichi en-aut-sei=Hamada en-aut-mei=Shoichi kn-aut-name=浜田正一 kn-aut-sei=浜田 kn-aut-mei=正一 aut-affil-num=2 ORCID= en-aut-name=ToeiKyoji en-aut-sei=Toei en-aut-mei=Kyoji kn-aut-name=桐栄恭二 kn-aut-sei=桐栄 kn-aut-mei=恭二 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=liquid-liquid distribution of ion-associates kn-keyword=liquid-liquid distribution of ion-associates en-keyword=quaternary ammonium ions kn-keyword=quaternary ammonium ions en-keyword=inorganic and organic anions kn-keyword=inorganic and organic anions en-keyword=aqueous and chloroform phases kn-keyword=aqueous and chloroform phases en-keyword=estimation of extraction constants kn-keyword=estimation of extraction constants END start-ver=1.4 cd-journal=joma no-vol=33 cd-vols= no-issue=2 article-no= start-page=119 end-page=121 dt-received= dt-revised= dt-accepted= dt-pub-year=1984 dt-pub=19840205 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Determination of cobalt by ion-pair liquid chromatography with 2-nitroso-1-naphthol-4-sulfonic acid kn-title=2-ニトロソ-1-ナフトール-4-スルホン酸を用いるイオン対クロマトグラフィーによるコバルトの定量 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Cobalt was spectrophotometrically determined as an anionic metal complex of 2-nitroso-1-naphthol-4-sulfonic acid (nitroso-NW acid) on a reversed-phase high-performance liquid chromatograph. An ODS column(4.6 mm i.d.×100 mm) was used, and the mobile phase consisted of 1.4×10(-2) M tetrabutylammonium bromide and phosphate buffer (pH 8,5×10(-3) M) in a mixture of 52 vol% methanol and 48 vol% distilled water. To 7.5ml of sample solution, 1 ml of citrate buffer solution(2 M, pH 5.4) and 1 ml of nitroso-NW acid(4×10(-3) M) were added. After 10 min, 0.5 ml of 2×10(-3) M EDTA was further added, and the resultant solution was diluted to 10 ml with distilled water. One hundred μl of the solution was injected on to the column. Detection was made on a UV detector at 368 nm. The calibration curve was linear in the range of (125)×10(-7) M of cobalt. By the proposed method, cobalt contents in four commercial nickel salts, Ni(NO(3))(2) · 6H(2)O, NiSO(4) (NH(4))(2) SO(4)·6H(2)O, NiSO(4)·6H(2)O, and NiCl(2)·6H(2)O, were determined to be (0.0030.06)% with relative standard deviation of 1.3% (seven determinations of the nitrate salt). en-copyright= kn-copyright= en-aut-name=SawatariIkuo en-aut-sei=Sawatari en-aut-mei=Ikuo kn-aut-name=沢谷郁夫 kn-aut-sei=沢谷 kn-aut-mei=郁夫 aut-affil-num=1 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=2 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=3 ORCID= en-aut-name=ToeiKyoji en-aut-sei=Toei en-aut-mei=Kyoji kn-aut-name=桐栄恭二 kn-aut-sei=桐栄 kn-aut-mei=恭二 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 en-keyword=determination of cobalt in nickel salts kn-keyword=determination of cobalt in nickel salts en-keyword=anionic complex of cobalt-2-nitroso-1-naphthol-4-sulfonic acid kn-keyword=anionic complex of cobalt-2-nitroso-1-naphthol-4-sulfonic acid en-keyword=reversed-phase ion-pair liquid chromatography kn-keyword=reversed-phase ion-pair liquid chromatography END start-ver=1.4 cd-journal=joma no-vol=33 cd-vols= no-issue=2 article-no= start-page=116 end-page=119 dt-received= dt-revised= dt-accepted= dt-pub-year=1984 dt-pub=19840205 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Continuous flow method for the determination of phosphorus using the fluorescence quenching of Rhodamine 6 G with molybdophosphate kn-title=モリブドリン酸によるローダミン6Gの消蛍光を利用するリンの連続流れ定量法 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Continuous flow method was examined for the determination of phosphorus. The molybdophosphate formed between orthophosphate and molybdate in hydrochloric acid medium diminished the fluorescence of Rhodamine 6 G. Carrier solution (distilled water) and reagent solution were propelled by double plunger pump P(1) and P(2) (flow rate : 0.98 ml/min), and sample solution(160μl) was injected into the carrier stream. The two streams were mixed in 20 cm long Teflon tubing (1 mm i.d.), and the mixture was flowed through a flow cell(18μl), at which the fluoresence of Rhodamine 6 G was detected(λ(ex) =350 nm, λ(em)=580 nm). The reagent solution consists of 0.035 M molybdenum and 1×10(-5) M Rhodamine 6 G in 0.8 M hydrochloric acid. Co-existing ions generally existing in river and sea waters did not interfere the determination of phosphorus. The calibration curve was linear from 0 to 45 ppb of phosphorus. The method was applied to sea water. The sampling rate was 20 samples per hour. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=MikasaHiroshi en-aut-sei=Mikasa en-aut-mei=Hiroshi kn-aut-name=三笠博司 kn-aut-sei=三笠 kn-aut-mei=博司 aut-affil-num=2 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=3 ORCID= en-aut-name=ToeiKyoji en-aut-sei=Toei en-aut-mei=Kyoji kn-aut-name=桐栄恭二 kn-aut-sei=桐栄 kn-aut-mei=恭二 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 en-keyword=continuous flow analysis of phosphorus by fluorophotometry kn-keyword=continuous flow analysis of phosphorus by fluorophotometry en-keyword=fluorescence quenching of Rhodamine 6 G with molybdophosphate kn-keyword=fluorescence quenching of Rhodamine 6 G with molybdophosphate en-keyword=sea water kn-keyword=sea water END start-ver=1.4 cd-journal=joma no-vol=34 cd-vols= no-issue=8 article-no= start-page=518 end-page=521 dt-received= dt-revised= dt-accepted= dt-pub-year=1985 dt-pub=19850805 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Fluorometric determination of ammonia in river water by flow injection analysis kn-title=フローインジェクション-蛍光法による河川水中のアンモニアの定量 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Flow injection analysis(FIA) was examined for the fluorometric determination of ammonia in river water. Ammonia reacted with ο-phthalaldehyde(OPA) in the presence of 2-mercaptoethanol(ME) to form a fluorescent substance at pH 9.5. The reagent solution containing 10(-2) M OPA and 10(-3) M ME and the carrier fluid(distilled water) were propelled by a double plunger pump at a rate of 1.2 ml/min. The 40μl sample solution, injected into the carrier stream, was mixed with the reagent solution in a Teflon tubing (3 m, 0.5 mm i.d.) and led to a flow cell(18 μl). Fluorescence excited at λ(ex)=350 nm was measured at λ(em)=486 nm. Ions present commonly in river waters did not interfere with the determination of ammonia. An anion exchange column installed just behind a sample injection valve in the flow system was effective in eliminating interferences with amino acids. Using the proposed FIA system, trace amounts of ammonia(3150 ppb as nitrogen) in river water were determined in the rate of 40 samples per h. en-copyright= kn-copyright= en-aut-name=MikasaHiroshi en-aut-sei=Mikasa en-aut-mei=Hiroshi kn-aut-name=三笠博司 kn-aut-sei=三笠 kn-aut-mei=博司 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= en-aut-name=ToeiKyoji en-aut-sei=Toei en-aut-mei=Kyoji kn-aut-name=桐栄恭二 kn-aut-sei=桐栄 kn-aut-mei=恭二 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=flow injection analysis of ammonia kn-keyword=flow injection analysis of ammonia en-keyword=reaction of ammonia with ο-phthalaldehyde and 2-mercaptoethanol kn-keyword=reaction of ammonia with ο-phthalaldehyde and 2-mercaptoethanol en-keyword=ammonia-nitrogen in waters by fluorophotometry kn-keyword=ammonia-nitrogen in waters by fluorophotometry END start-ver=1.4 cd-journal=joma no-vol=36 cd-vols= no-issue=3 article-no= start-page=207 end-page=209 dt-received= dt-revised= dt-accepted= dt-pub-year=1987 dt-pub=19870305 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Spectrophotometric determination of nitrate ion using nitrosation/FIA kn-title=ニトロソ化反応を利用する硝酸イオンのフローインジェクション/吸光光度法 en-subtitle= kn-subtitle= en-abstract= kn-abstract=N, N-Bis (2-hydroxypropyl) aniline (BHPA) reacts with nitrite ion in an acidic medium to form a red product, which has the maximum absorption at 500 nm. On the basis of this color reaction, FIA of nitrate was established. Nitrate ion could be reduced to nitrite ion by passing through the reduction column(2 mm×30 cm) packed with copperized cadmium {Cu(Cd) : particle size, about 0.5 mm}, which was installed just behind the sample injection valve. The carrier solution(10(-3) M EDTA, pH 8) and the reagent solution (8×10(-4) M BHPA, 0.35 M HCl, 0.15 M H(3)PO(4)) were propelled at the flow rate of 0.7 ml/min by using a double-plunger pump. The sample(120 μl) was injected into the carrier stream by using a 6-way injection valve. The reaction coil(0.5 mm×2 m) was kept in a thermostatically controlled water bath(80℃). The cooling coil(0.5 mm×50 cm), which was installed just behind the reaction coil, was kept in a water bath (tap water temperature). A calibration curve was linear up to 2×10(-4) M nitrate. The detection limit corresponding to S/N=2 was 10(-6) M nitrate, and the relative standard deviation (10 injections) was 0.4%, and the sampling rate was 40 samples per hour. Nitrate in river water at concentrations of 10(-5) M level was determined. en-copyright= kn-copyright= en-aut-name=ShiCheng Rui en-aut-sei=Shi en-aut-mei=Cheng Rui kn-aut-name=石成瑞 kn-aut-sei=石 kn-aut-mei=成瑞 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= en-aut-name=ToeiKyoji en-aut-sei=Toei en-aut-mei=Kyoji kn-aut-name=桐栄恭二 kn-aut-sei=桐栄 kn-aut-mei=恭二 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=FIA of nitrate kn-keyword=FIA of nitrate en-keyword=reduction of nitrate to nitrite on Cu (Cd) column kn-keyword=reduction of nitrate to nitrite on Cu (Cd) column en-keyword=color reaction of nitrite with N kn-keyword=color reaction of nitrite with N END start-ver=1.4 cd-journal=joma no-vol=16 cd-vols= no-issue=12 article-no= start-page=1303 end-page=1308 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20001210 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Adsorption Behavior of Metal Ions on Cross-linked Chitosan and the Determination of Oxoanions after Pretreatment with a Chitosan Column en-subtitle= kn-subtitle= en-abstract= kn-abstract=The adsorption behavior of 60 elements at the 10 ng ml(-1) level on high-porous cross-linked chitosan in a packed mini-column was systematically examined. The chitosan used could adsorb anionic species quantitatively as oxoanions or chloro complex anions of metals, such as Ti, V, Mo, W, Ga, Bi, Au(III), Pt(IV) and Pd(II), in sample solutions by an ion-exchange mechanism, and could adsorb some metal ions by a chelating mechanism. Most of the metal ions adsorbed on the chitosan were eluted with 1 M nitric acid, and other noble metals, such as Au, Pt and Pd, were eluted by a solution containing 1 M hydrochloric acid and 0.05 M thiourea. The adsorption fraction of metal ions was investigated by measuring metal ions in eluates by ICP-MS. By using the proposed column pretreatment method, metal ions present as their oxoanions in river-water samples, such as Ti, V, Mo, W, Ga and Bi, were collected on the cross-linked chitosan, eluted and determined. The method was applied to an analysis of reference materials distributed by the Japan Society for Analytical Chemistry: JAC 0031 and JAC 0032. The analytical results agreed closely with other reference values. en-copyright= kn-copyright= en-aut-name=GaoYunhua en-aut-sei=Gao en-aut-mei=Yunhua kn-aut-name=高雲華 kn-aut-sei=高 kn-aut-mei=雲華 aut-affil-num=1 ORCID= en-aut-name=LeeKyue-Hyung en-aut-sei=Lee en-aut-mei=Kyue-Hyung kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=3 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 END start-ver=1.4 cd-journal=joma no-vol=16 cd-vols= no-issue=7 article-no= start-page=731 end-page=738 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000710 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Simultaneous Determination of Trace Elements in River-water Samples by ICP-MS in Combination with a Discrete Microsampling Technique after Enrichment with a Chitosan-based Chelating Resin en-subtitle= kn-subtitle= en-abstract= kn-abstract=A new technique for the preconcentration of trace elements and matrix elimination with a chitosan-based chelating resin was proposed as a useful pretreatment prior to a measurement by inductively coupled plasma-mass spectrometry (ICP-MS). A small volume of the sample solution (80 µl) was discretely introduced into a nebulizer of ICP-MS using a segmented flow injection (SFI) system; a maximum of fifteen elements were simultaneously measured by a single injection. A chitosan-based chelating resin containing iminodiacetate (IDA) functional groups was used for matrix elimination and enrichment of analyte metal ions. Several metal ions, such as Al, Fe, Ni, Co, Cu, Zn, Ag, Cd, Pb and U, were quantitatively retained on the IDA chelating resin in a micro-column (resin: 1 ml) at pH 6, whereas Na, K, Mg and Ca were completely eluted from the column by washing with an ammonium acetate solution. The concentrations of 24 and 26 elements in river water certified reference materials, JAC 0031 and JAC 0032, respectively, were determined by the proposed SFI/ICP-MS system after pretreating the samples with the proposed technique, as well as without any pretreatment. The thus-obtained analytical data were evaluated by comparing them with the reference values, as well as with those obtained in other studies. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=LeeKyue-Hyung kn-aut-sei=Lee kn-aut-mei=Kyue-Hyung aut-affil-num=1 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=2 ORCID= en-aut-name=TakayanagiToshio en-aut-sei=Takayanagi en-aut-mei=Toshio kn-aut-name=高柳俊夫 kn-aut-sei=高柳 kn-aut-mei=俊夫 aut-affil-num=3 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 END start-ver=1.4 cd-journal=joma no-vol=17 cd-vols= no-issue=11 article-no= start-page=1285 end-page=1290 dt-received= dt-revised= dt-accepted= dt-pub-year=2001 dt-pub=20011110 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Highly Sensitive Determination Method for Total Carbonate in Water Samples by Flow Injection Analysis Coupled with Gas-Diffusion Separation en-subtitle= kn-subtitle= en-abstract= kn-abstract=A spectrophotometric method for the determination of total carbonate in water samples was developed. The method is based on the color change of an acid-base indicator in relation to the concentration of permeable gas substances through a membrane. By using a new portable FIA system equipped with a gas-diffusion unit, a highly sensitive and on-site determination of total carbonate in aqueous solutions was investigated. A new color-change system with 4-(2',4'-dinitrophenylazo)-1-naphthol-5-sulfonic acid (DNN5S) was developed. Absorbance changes of the reagent solution were measured at 450 nm with a light-emitting diode (LED) as a light source. A new type of gas-diffusion unit was used, and was constructed with double tubing: the inner tubing was a micro porous PTFE (polytetrafluoroethylene) tubing (1.0 mm inner diameter and 1.8 mm outer diameter, pore size 2 μm, porosity 50%); the outer tubing was made of glass with 2.0 mm inner diameter. The optimized system conditions were as follows: the sample size was 200 μl, the temperature of the air bath for the gas-diffusion unit was 25℃, and the length of the gas-diffusion unit was 15 cm; each flow rate was 0.3 ml min(-1). For measuring carbonate at low concentrations, a method for preparing water with less carbonate was proposed: the carbonate content of the water was decreased down to 5×10(-7) M. The calibration graph was rectilinear from 1×10(-6) M to 10(-3) M, and the detection limit (corresponding to a signal-to-noise ratio of 3) was 1×10(-6) M of carbonate. The relative standard deviation (RSD) of ten measurements of 2.3×10(-5) M Na(2)CO(3) solution was 1.9%. The total carbonate in various kinds of water (such as river, sea, rain, distilled and ultra purified) was determined. en-copyright= kn-copyright= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=1 ORCID= en-aut-name=WeiYanlin en-aut-sei=Wei en-aut-mei=Yanlin kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=YamamotoMasaki en-aut-sei=Yamamoto en-aut-mei=Masaki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=TanakaHiroki en-aut-sei=Tanaka en-aut-mei=Hiroki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=TakayanagiToshio en-aut-sei=Takayanagi en-aut-mei=Toshio kn-aut-name=高柳俊夫 kn-aut-sei=高柳 kn-aut-mei=俊夫 aut-affil-num=5 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=6 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 affil-num=5 en-affil= kn-affil=岡山大学 affil-num=6 en-affil= kn-affil=岡山大学 END start-ver=1.4 cd-journal=joma no-vol=18 cd-vols= no-issue=9 article-no= start-page=1021 end-page=1025 dt-received= dt-revised= dt-accepted= dt-pub-year=2002 dt-pub=20020910 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Equilibrium Analysis of Reactions of Metal-Pyridylazoresorcinolato Chelates with Quaternary Ammonium Ion, Nonionic Surfactant and Polyethylene Glycol in Aqueous Solution by Capillary Zone Electrophoresis en-subtitle= kn-subtitle= en-abstract= kn-abstract=The resolutions of metal-4-(2-pyridylazo)resorcinol chelates by capillary zone electrophoresis (CZE) were investigated in the presence of some interacting reagents; also, equilibrium reactions between the chelates and the interacting reagents were analyzed in an aqueous solution. Among nine metal chelates formed in aqueous solution, the chelates of V(V), Fe(II), Co(III), Ni(II), and Cu(II) were resolved and detected by CZE, while other chelates were decomposed during electrophoretic migration. The electrophoretic mobility of the chelates of Fe(II), Ni(II), and Cu(II) increased with increasing pH of the migrating solution; also, the acid-dissociation constants of these three chelates were determined by analyzing the mobility change. The ion-association constants of the five anionic chelates and pyridylazoresorcinolate ion with quaternary ammonium ions were also determined by analyzing the mobility change. The binding behavior of the ligand and its chelates with nonionic surfactant micelle, as well as with polyethylene glycol, were investigated, and their binding constants were determined through the mobility change. When Brij 35 was used as a nonionic surfactant interacting with the anionic chelates, the FeII chelate decomposed at Brij 35 concentrations over 6.67 mM. The equilibrium constants and the reactivity were compared with each other. en-copyright= kn-copyright= en-aut-name=TakayanagiToshio en-aut-sei=Takayanagi en-aut-mei=Toshio kn-aut-name=高柳俊夫 kn-aut-sei=高柳 kn-aut-mei=俊夫 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 END start-ver=1.4 cd-journal=joma no-vol=18 cd-vols= no-issue=10 article-no= start-page=1121 end-page=1125 dt-received= dt-revised= dt-accepted= dt-pub-year=2002 dt-pub=20021010 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Sensitivity Improvement of Ammonia Determination Based on Flow-Injection Indophenol Spectrophotometry with Manganese(II) Ion as a Catalyst and Analysis of Exhaust Gas of Thermal Power Plant en-subtitle= kn-subtitle= en-abstract= kn-abstract=The sensitivity improvement of a flow-injection spectrophotometric method for the determination of ammonia was examined based on an indophenol blue coloration reaction with salicylate and hypochlorite in the presence of manganese(II) as a reaction promotion catalyst. The optimal conditions for achieving higher sensitivity of ammonia determination were examined using a three-line flow system. The limit of detection corresponding to a signal-to-noise ratio (S/N) of 3 was 0.005 mg l(-1) (≡ 5 ppb) of NH(4)(+). A calibration graph was linear in the range from 5 ppb to 1000 ppb of ammonium ion. The relative standard deviations (n=9) for 50 ppb and 100 ppb of ammonium ion were 6.4% and 2.2%, respectively. The proposed method was applied to the determination of ammonia in the exhaust gas of a thermal power plant. Prior to the FIA determination, ammonia in the exhaust gas was absorbed into a boric acid solution; the absorption solution was then analyzed by the proposed FIA. en-copyright= kn-copyright= en-aut-name=TsuboiTomonori en-aut-sei=Tsuboi en-aut-mei=Tomonori kn-aut-name=坪井知則 kn-aut-sei=坪井 kn-aut-mei=知則 aut-affil-num=1 ORCID= en-aut-name=HiranoYoshio en-aut-sei=Hirano en-aut-mei=Yoshio kn-aut-name=平野義男 kn-aut-sei=平野 kn-aut-mei=義男 aut-affil-num=2 ORCID= en-aut-name=ShibataYoshinori en-aut-sei=Shibata en-aut-mei=Yoshinori kn-aut-name=柴田佳典 kn-aut-sei=柴田 kn-aut-mei=佳典 aut-affil-num=3 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=The Chugoku Electric Power Co., Inc. Technical Research Center affil-num=2 en-affil= kn-affil=The Chugoku Electric Power Co., Inc. Technical Research Center affil-num=3 en-affil= kn-affil=Chuden Kankyo Technos Co., Ltd. affil-num=4 en-affil= kn-affil=岡山大学 END start-ver=1.4 cd-journal=joma no-vol=18 cd-vols= no-issue=10 article-no= start-page=1121 end-page=1125 dt-received= dt-revised= dt-accepted= dt-pub-year=2002 dt-pub=20021010 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Adsorption Behavior of Mercury and Precious Metals on Cross- Linked Chitosan and the Removal of Ultratrace Amounts of Mercury in Concentrated Hydrochloric Acid by a Column Treatment with Cross-Linked Chitosan en-subtitle= kn-subtitle= en-abstract= kn-abstract=Cross-linked chitosan was synthesized with chitosan and ethylene glycol diglycidyl ether. The adsorption behavior of trace amounts of metal ions on the cross-linked chitosan was systematically examined by packing it in a mini-column, passing a metal solution through it and measuring metal ions in the effluent by ICP-MS. The cross-linked chitosan adsorbed mercury and precious metals (Pd, Pt, and Au) at pH values from acidic to neutral. Especially, mercury in concentrated hydrochloric acids could be adsorbed on cross-linked chitosan quantitatively by an anion-exchange mechanism in the form of a stable chloride complex. This method was applied to the removal of mercury from commercially available hydrochloric acid; more than 97% of mercury was removed, and the residual mercury in the hydrochloric acid (Grade: for trace analysis) was found to be 0.15 ppb. Mercury adsorbed on the cross-linked chitosan could be easily desorbed with an eluent containing 1 M hydrochloric acid and 0.05 M thiourea. The thus-refreshed crosslinked chitosan could be repeatedly used for the removal of mercury in hydrochloric acid. en-copyright= kn-copyright= en-aut-name=OshitaKoji en-aut-sei=Oshita en-aut-mei=Koji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=2 ORCID= en-aut-name=GaoYun-hua en-aut-sei=Gao en-aut-mei=Yun-hua kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=LeeKyue-Hyung en-aut-sei=Lee en-aut-mei=Kyue-Hyung kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=Technical Institute of Physics and Chemistry, Chinese Academy of Sciences affil-num=5 en-affil= kn-affil=岡山大学 END start-ver=1.4 cd-journal=joma no-vol=33 cd-vols= no-issue=1 article-no= start-page=31 end-page=36 dt-received= dt-revised= dt-accepted= dt-pub-year=1984 dt-pub=19840105 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Relative extractabilities of cations and anions in the extraction of ion associates and estimation of extraction constants from chemical structure kn-title=イオン会合抽出における陽,陰イオンの相対的抽出性と抽出定数の推定 en-subtitle= kn-subtitle= en-abstract=Extraction constant, K(ex), for the chloroform extraction of ion associates from aqueous solution was divided into two parameters, C and A, assigned to the cation and the anion, respectively: logK(ex)=C+A. In estimating the values of C or A for various ions, a hypothetical cation, -N_??_-(+) (long-chain alkyltrimethylammonium type), with no alkyl groups nor hydrogen atoms was chosen as a reference ion for which C=0. C value for long-chain alkyltrimethylammonium cations can be calculated from C=0.59n, where n is the number of carbons and 0.59 is the value of π(CH(2)), contribution constant of methylene group to extraction constant. C values for other alkylammonium ions were determined experimentally and compared with those calculated on the assumption of additivity of contribution constants of functional groups. C values for other cationic groups were as follows: -1.20 for -N_??_-(+) (symmetrical tetraalkylammonium type), -0.56 for >-NH(3)(+) 0.40 for NH(2)(+), 1.29 for _??_ NH(+), 4.72 for -_??_NH(+), 7.53 for -(+)N_??_-N=N-_??_N(C(2)H(5))(2), and 10.74 for C(C(6)H(4)-)(3)(+), respectively. By using these C values, A values for inorganic and organic anions were determined. A values for inorganic anions were as follows: -11.06 for F(-), -9.07 for OH(-), -8.11 for NO(2)(-), -8.08 for Cl(-), -7.05 for NO(3)(-), -6.89 for Br(-), -5.80 for BF(4)(-), -5.32 for I(-), -5.17 for SCN(-), -5.03 for ClO(4)(-), and -4.45 for ReO(4)(-), respectively. A values for anionic groups were as follows: -9.08 for -SO(3)(-), -10.73 for -COO(-), and -7.38 for -OSO(3)(-), respectively. By using the values of C and A, the extraction constants (logK(ex)) for ion associate (C(+)·A(-)) were estimated and compared with those obtained experimentally. The differences between them were smaller than ±0.3 log unit. kn-abstract=水-クロロホルム系でのイオン会合抽出におけるイオンの抽出性の相対的尺度として,陽イオンに対しC値,陰イオンに対しA値を割り当てた.これらの値の算出の際の基準にはアルキル鎖及び水素原子を全く持たない仮想的な陽イオン[-〓N-(+)]をとった.C値,A値と抽出定数(logK(ex))の関係は,logK(ex)=C+Aで表される.陽イオンとして14種の第四級アンモニウムイオン,テトラフェニルホスホニウム(アルソニウム)イオン,5種のアゾ系染料陽イオン,7種のトリフェニルメタン系染料陽イオン及びメチレンブルーのC値を決めた.又π値(置換基の寄与)を用いるC値の計算方法についても考察した.C値を用い,無機,有機陰イオンのA値も決定した.得られたC値及びA値を用いて約150種のイオン会合体の抽出定数を推定し,既報の実測値との比較をしたところ,±0.3log単位程度の誤差であった.又著者以外により報告されている抽出定数との一致も良好であった. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 en-keyword=relative extractability of cations and anions kn-keyword=relative extractability of cations and anions en-keyword=estimation of extraction constants of ion associates kn-keyword=estimation of extraction constants of ion associates en-keyword=extraction with chloroform kn-keyword=extraction with chloroform END start-ver=1.4 cd-journal=joma no-vol=34 cd-vols= no-issue=10 article-no= start-page=643 end-page=645 dt-received= dt-revised= dt-accepted= dt-pub-year=1985 dt-pub=19851005 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Solvent extraction-spectrophotometric determination of copper with 2-nitroso-5-dimethylaminophenol and zephiramine kn-title=2-ニトロソ-5-ジメチルアミノフェノールとゼフィラミンを用いる銅の溶媒抽出-吸光光度定量 en-subtitle= kn-subtitle= en-abstract= kn-abstract=2-Nitroso-5-dimethylaminophenol (nitroso-DMAP) reacts with copper(II) ion to form a 1:2 complex in an aqueous solution. In the presence of zephiramine (tetradecyldimethylbenzylammonium chloride), a 1:3 complex is formed and can be extracted into chloroform. The excess of nitroso-DMAP co-extracted with complex anion into organic phase can be removed by adding an adequate amount of chloride ion at about pH 12. Maximum absorption wavelength of the copper complex in the organic phase is 468 nm, at which the molar absorptivity was found to be 3.6×10(4) l mol(-1) cm(-1). This method was applied to determine micro amounts of copper in iron and steel samples and aluminium alloys. The procedure is as follows. An adequate amount of the sample was dissolved in aqua regia. The resulting solution was evaporated nearly to dryness. The residue was re-dissolved in distilled water to give an adequate volume. Five milliliters of the sample solution were taken into a stoppered test tube. Ascorbic acid and potassium chloride solutions were then added. Dichlorocopper(I) ion was extracted with chloroform solution of zephiramine. The organic phase was shaken with an aqueous solution containing hydrogen peroxide, nitroso-DMAP, potassium chloride, and potassium hydroxide to form the copper complex of nitroso-DMAP and to remove the excess of reagent in the organic phase. The absorbance at 468 nm was measured against the reagent blank. en-copyright= kn-copyright= en-aut-name=ShiCheng Rui en-aut-sei=Shi en-aut-mei=Cheng Rui kn-aut-name=石成瑞 kn-aut-sei=石 kn-aut-mei=成瑞 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= en-aut-name=ToeiKyoji en-aut-sei=Toei en-aut-mei=Kyoji kn-aut-name=桐栄恭二 kn-aut-sei=桐栄 kn-aut-mei=恭二 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=Spectrophotometry of copper with 2-nitroso-5-dimethylaminophenol kn-keyword=Spectrophotometry of copper with 2-nitroso-5-dimethylaminophenol en-keyword=solvent extraction of copper complex anion with zephiramine kn-keyword=solvent extraction of copper complex anion with zephiramine en-keyword=analysis of iron and steel and aluminium alloys kn-keyword=analysis of iron and steel and aluminium alloys END start-ver=1.4 cd-journal=joma no-vol=35 cd-vols= no-issue=4 article-no= start-page=344 end-page=348 dt-received= dt-revised= dt-accepted= dt-pub-year=1986 dt-pub=19860405 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Spectrophotometric determination of boron by flow injection analysis kn-title=フローインジェクション分析法によるホウ素の吸光光度定量 en-subtitle= kn-subtitle= en-abstract=Spectrophotometric determination of boron existing as boric acid in water was examined with H-resorcinol {1-(2, 4-dihydroxy-1-phenylazo)-8-hydroxynaphthalene-3, 6-disulfonic acid} by flow injection analysis. Carrier solution (deionized water) and reagent solution were propelled by double plunger pump (flow rate : 0.6 ml/min), and sample solution (320 μl) was injected into a carrier stream. The reagent solution was prepared by dissolving 0.096 g of H-resorcinol in 1 1 of ammonium acetate buffer solution (50 g/l, pH 5.5) containing 3.72 g of EDTA. The two streams were mixed in 16 m long Teflon tubing (0.5 mm i.d.), and the mixture was flowed through a flow cell (36 μl; 1.5 mm i.d.×20 mm), at which the absorbance of boron-H-resorcinol complex was detected (λ=510 nm). The linear relationship between the peak height and concentration of boron was obtained in the range of 0 to 1 ppm. The detection limit was 5 ppb (S/N=2). The sampling rate was 30 samples per hour. Generally ions co-existing in river and sea waters did not interfere with the determination of boron by adding EDTA solution. kn-abstract=H-レゾルシノール{1-(2,4-ジヒドロキシ-1-フェニルアゾ)-8-ヒドロキシナフタレン-3,6-ジスルホン酸}とホウ酸との反応を利用したホウ素の吸光光度フローインジェクション分析について検討した.ダブルプランジャー型ポンプを用い,一方にキャリヤー液(イオン交換水)を流し,もう一方に反応試薬溶液(H-レゾルシノールとEDTAを含むpH5.5の酢酸アンモニウム緩衝液)を流し,キャリヤー液流中に試料水を注入した.キャリヤー液と反応試薬液は反応コイル中で混合した.錯体の生成を促進するために,反応コイルを恒温槽中(100℃)で加熱する.その後混合液はフローセル(36μl)に導かれ,ホウ素錯体の吸光度を測定した(波長510nm).ホウ酸と反応する試薬についてはH酸(1-アミノ-8-ヒドロキシナフタレン-3,6-ジスルホン酸)誘導体14種類について検討した結果,温レゾルシノールを用いることにした.河川水,海水中に普通存在する程度の金属イオン及び無機陰イオンは定量を妨害しない.0.1M程度のナトリウムイオン,カリウムイオンは負の誤差を与えるが,海水は20倍に希釈して測定するのでこれらイオンの妨害は問題とはならなかった.検量線は0～夏PP田の範囲で直線性を示し,検出限界は5ppb(S/N=2)であった.又ホウ素108ppbでの10回繰り返し実験の相対標準偏差は0.53%であった.毎分0.6mlで送液し試料注入量320μl,反応コイル0.5mm i.d.×16mとしたときの分析速度は1時間当たり約30試料である. en-copyright= kn-copyright= en-aut-name=ToeiKyoji en-aut-sei=Toei en-aut-mei=Kyoji kn-aut-name=桐栄恭二 kn-aut-sei=桐栄 kn-aut-mei=恭二 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=3 ORCID= en-aut-name=OnodaMinoru en-aut-sei=Onoda en-aut-mei=Minoru kn-aut-name=小野田稔 kn-aut-sei=小野田 kn-aut-mei=稔 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 en-keyword=spectrophotometry of boron with H-resorcinol by flow injection analysis kn-keyword=spectrophotometry of boron with H-resorcinol by flow injection analysis en-keyword=water samples kn-keyword=water samples END start-ver=1.4 cd-journal=joma no-vol=36 cd-vols= no-issue=12 article-no= start-page=T132 end-page=T135 dt-received= dt-revised= dt-accepted= dt-pub-year=1987 dt-pub=19871205 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Determination of total carbonate-carbon in water by FIA with gas-diffusion unit kn-title=ガス拡散/フローインジェクション分析法による水中の総炭酸の定量 en-subtitle= kn-subtitle= en-abstract=In FIA, a gas-diffusion technique is highly selective, because there are only a few species which are generated as gases at room temperature. In this paper, the authors determined the total carbonate-carbon content in water by FIA with gas-diffusion unit assembly with a tubular microporous polytetrafluoroethylene (PTFE) membrane, which was reported previously. In this method, the sample was injected into a carrier stream of sulfuric acid in which carbonate and hydrogencarbonate ions injected were converted to gaseous carbon dioxide. The reagent stream which contained Cresol Red and was adjusted to pH 9.0, and the carrier stream, were fed to the gas-diffusion unit. Carbon dioxide passed through the PTFE membrane: the color change of Cresol Red to the acidic form was measured at 410 nm in a flow-through cell. The detection limit was 5×10(-6) M (S/N=3), the response was linear up to 1.2×10(-3) M, the sampling rate was 15 h(-1), and the relative standard deviation obtained by ten injections of tap water (4.7×10(-4) M) was 0.8%. The results obtained by the proposed method were in good agreement with those obtained by indirect photometric ion chromatography. kn-abstract=水中の総炭酸(二酸化炭素,炭酸塩及び炭酸水素塩)のガス拡散/吸光光度FIA法について検討した.キャリヤー液として硫酸を用い,試料中の総炭酸をガス状の二酸化炭素にしてガス拡散装置で分離しガス状二酸化炭素のみ試薬溶液に吸収させる.試薬溶液として酸-塩基指示薬であるクレゾールレッドを含む水溶液を使用し,pHの変化による吸光度の変化から定量する.ガス拡散装置はフランジ型の接続方法を採用しており,接着剤を用いる必要がなく接続部から液漏れしにくい.本法は1.2×10(-3)M以下の総炭酸が定量でき1時間当たり15試料の分析が可能であった.又,検出限界は5×10(-6)Mであり,水道水(4.7×10(-4)M)の10回繰り返し定量の相対標準偏差は,0.8%と良好であった.環境水を本法で定量した結果と間接吸光検出イオンクロマトグラフィーで定量した結果はよく一致した. en-copyright= kn-copyright= en-aut-name=KuwakiTohru en-aut-sei=Kuwaki en-aut-mei=Tohru kn-aut-name=桑木亨 kn-aut-sei=桑木 kn-aut-mei=亨 aut-affil-num=1 ORCID= en-aut-name=ToeiKyoji en-aut-sei=Toei en-aut-mei=Kyoji kn-aut-name=桐栄恭二 kn-aut-sei=桐栄 kn-aut-mei=恭二 aut-affil-num=2 ORCID= en-aut-name=AkibaMasanori en-aut-sei=Akiba en-aut-mei=Masanori kn-aut-name=秋庭正典 kn-aut-sei=秋庭 kn-aut-mei=正典 aut-affil-num=3 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=4 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 affil-num=5 en-affil= kn-affil=岡山大学 en-keyword=determination of total carbonate-carbon kn-keyword=determination of total carbonate-carbon en-keyword=FIA with a gas-diffusion unit kn-keyword=FIA with a gas-diffusion unit en-keyword=tublar microporous polytetrafluoroethylene kn-keyword=tublar microporous polytetrafluoroethylene en-keyword=absorbance measurement of Cresol Red kn-keyword=absorbance measurement of Cresol Red END start-ver=1.4 cd-journal=joma no-vol=36 cd-vols= no-issue=9 article-no= start-page=561 end-page=565 dt-received= dt-revised= dt-accepted= dt-pub-year=1987 dt-pub=19870905 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Spectrophotometric determination of hydrogen peroxide by FIA with Bindschedler's Green leuco base as color reagent kn-title=ビンドシェドラーズグリーンロイコ塩基を用いるフローインジェクション分析法による過酸化水素の吸光光度定量 en-subtitle= kn-subtitle= en-abstract=A FIA method for the determination of hydrogen peroxide with a Bindschedler's Green leuco base (LBG) as color reagent and iron(II) as catalyst is described. LBG was oxidized by hydrogen peroxide to Bindschedler's Green (BG(+)) which showed a maximum absorbance at 725 nm. The increase in the absorbance at 725 nm was measured for the determination of hydrogen peroxide. The reagent solution (1) consisted of 10 mM hydrochloric acid containing 1 mM LBG, and the reagent solution (2) consisted of 0.1 M acetate buffer (pH 4.6) containing 50 mM ammonium iron(II) sulfate and 0.65 M hydroxylamine hydrochloride. Reagent solutions (1) and (2), and a carrier solution (deionized water) were propelled by two double plunger pumps (flow rate: 0.8 ml/min), and a sample solution (50 μl) was injected into the carrier stream. After mixing the reagent solution (1) and (2) in the preheating coil, the mixture stream was mixed with the carrier stream in the reaction coil (37℃). The linear relationship between the peak height and the concentration of hydrogen peroxide was obtained in the range of 0 to 1 ppm. The relative standard deviation of 0.58 ppm hydrogen peroxide was 0.4% (n=10). The detection limit was 5 ppb (S/N=2). The sampling rate was 30 samples per hour. The glucose in the range of 0 to 10 ppm was determined by the FIA method after the reaction with glucose oxidase. kn-abstract=ビンドシェドラーズグリーンロイコ塩基(LBG)を色原体とし,Fe(II)を触媒としたFIA系による過酸化水素の定量法について検討した.弱酸性溶液中,Fe(II)が存在するとLBGは過酸化水素によって725nmに吸収極大を持つ緑色のビンドシェドラーズグリーン(BG(+))に酸化され,この波長での吸光度の増加を利用して過酸化水素を定量した.pH及び共存させる塩酸ヒドロキシルアミンの濃度を調節することにより,過酸化水素が0~1ppmの範囲で検量線は直線性を示す.過酸化水素0.58ppmでの10回繰り返し測定の相対標準偏差は0.4%で,検出限界は5ppb(S/N=2)であった.1時間当たりの分析速度は30検体であった.市販の各種水あめ中のグルコース(3~96%)を,グルコースオキシターゼで反応させた後,FIAで測定した. en-copyright= kn-copyright= en-aut-name=AkibaMasanori en-aut-sei=Akiba en-aut-mei=Masanori kn-aut-name=秋庭正典 kn-aut-sei=秋庭 kn-aut-mei=正典 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= en-aut-name=ToeiKyoji en-aut-sei=Toei en-aut-mei=Kyoji kn-aut-name=桐栄恭二 kn-aut-sei=桐栄 kn-aut-mei=恭二 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山理科大学教養部 en-keyword=spectrophotometry of hydrogen peroxide kn-keyword=spectrophotometry of hydrogen peroxide en-keyword=Bindschedler's Green leuco base kn-keyword=Bindschedler's Green leuco base en-keyword=FIA kn-keyword=FIA END start-ver=1.4 cd-journal=joma no-vol=36 cd-vols= no-issue=8 article-no= start-page=503 end-page=507 dt-received= dt-revised= dt-accepted= dt-pub-year=1987 dt-pub=19870805 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Determination of total carbonate-carbon in river water by ion chromatography with photometric detection kn-title=吸光光度検出イオンクロマトグラフィーによる河川水中の総炭酸の定量 en-subtitle= kn-subtitle= en-abstract=Determination of total carbonate-carbon in river water was achieved by ion chromatography with an ultraviolet photometric detector and an anion exchange column(TSK gel IC-Anion PW, 4.6 mm i.d.×50 mm). Trimellitate (1,2,4-benzenetricarboxylate, 4×10(-4) M) solution(pH 7.5) was used as an eluent. Ten microliters of sample solution was injected and decrease in absorbance of the trimellitate eluent at 270 nm was detected. Calcium and magnesium ions interfere with the determination of total carbonate-carbon. These could be removed completely by passing the sample solution through a cation exchange-type pretreatment cartridge column (sodium type). The expelled trimellitate ion from the column by anions (chloride, sulfate and nitrate ions) in sample solution decreased the peak height of hydrogen carbonate ion. This interference could be corrected by using the summation of peak areas of coexisting anions. By the proposed method, total carbonate-carbon in river water was determined. For total carbonate-carbon, the results were in good agreement with the values obtained by FIA. kn-abstract=吸光光度検出器を用いたイオンクロマトグラフィーによる,河川水中の総炭酸(炭酸,炭酸水素イオン及び炭酸イオンの合量)の定量法が検討された.吸収を示す溶離イオンとしては,トリメリット酸イオン(1,2,4-ベンゼントリカルボン酸イオン)を用い,陰イオン交換カラム(TSK gel IC-Anion-PW, 4.6mm i.d.×50mm)を用いた.試料中のカルシウム,マグネシウムイオンは,溶離イオンのカルボン酸イオンと反応し,総炭酸の定量に影響を与える.この妨害は,Na型に変えたイオン交換型試料前処理カートリッジカラム(Toyopak IC-SPM)に試料を通すことにより完全に除くことができた.試料中の陰イオンにより,追い出されてきたトリメリテートイオンの吸収は炭酸水素イオンのピークに影響を与え,負の誤差を生じる.この誤差は,試料中に共存する陰イオンのピークの面積の和を用いることにより補正可能であることが分かった.河川水中の総炭酸の定量を行ったところ,FIAにより得られた値と良く一致した. en-copyright= kn-copyright= en-aut-name=HironakaTakashi en-aut-sei=Hironaka en-aut-mei=Takashi kn-aut-name=弘中孝志 kn-aut-sei=弘中 kn-aut-mei=孝志 aut-affil-num=1 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=2 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=indirect photometric ion chromatography kn-keyword=indirect photometric ion chromatography en-keyword=hydrogen carbonate ion in river water kn-keyword=hydrogen carbonate ion in river water en-keyword=elution with 1, 2 kn-keyword=elution with 1, 2 END start-ver=1.4 cd-journal=joma no-vol=36 cd-vols= no-issue=8 article-no= start-page=T81 end-page=T84 dt-received= dt-revised= dt-accepted= dt-pub-year=1987 dt-pub=19870805 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Determination of ammoniacal nitrogen in water by FIA with a gas-diffusion unit kn-title=ガス拡散/フローインジェクション分析法による水中のアンモニア態窒素の定量 en-subtitle= kn-subtitle= en-abstract=In this paper, the authors present an assembly of a gas-diffusion unit with a tubular microporous PTFE (polytetrafluoroethylene) membrane, constructed without any glue, and also present the determination of ammoniacal nitrogen in water. In this method, the sample was injected into an alkaline stream (carrier stream) in which the ammonium ions injected were converted to ammonia molecules, then the carrier stream flowed into the gas-diffusion unit. Reagent solution, which contained Thymol Blue and was adjusted to pH 8.4, was also fed to the gas-diffusion unit, and flowed through the microporous PTFE membrane tubing. Ammonia passed through the PTFE membrane and reacted with the acidic form of Thymol Blue to change it to the basic form. The color change to the basic form was measured at 596 nm in a flow-through cell. The detection limit was about 2 ppb as ammoniacal nitrogen, the response was linear up to 5 ppm, the sampling rate was 25 h(-1), and the relative standard deviations obtained by nine injections of 20 ppb and 200 ppb solutions were 3.8% and 1.6%, respectively. The results obtained by directly injecting water samples were in good agreement with that obtained by injecting the solutions prepared according to the Micro-Kjeldahl's distillation method. kn-abstract=水中のアンモニア態窒素のガス拡散/吸光光度FIAについて検討した.キャリヤー液として水酸化ナトリウム溶液を用いることにより,試料中のアンモニウムイオンをガス状のアンモニアとし,多孔質ポリテトラフルオロエチレンチューブを使用したガス拡散装置で分離した.アンモニアガスはチモールブルー溶液に吸収させ,pHの変化を596nmで測定する吸光度の変化に変えて定量した.ガス拡散装置はフランジ型の接続方法を採用し,液漏れしにくいものを製作した.本法によれば5ppm以下のアンモニア態窒素を1時間当たり25試料の速さで定量できた.又,検出限界は2ppbであり,20及び200ppbのアンモニア態窒素の9回繰り返し定量の相対標準偏差はそれぞれ3.8及び1.6%であった.環境水をFIA装置に直接注入してアンモニア態窒素を定量した結果とミクロケルダール蒸留法で不純物を取り除いた後本法で定量した結果は良く一致した. en-copyright= kn-copyright= en-aut-name=KuwakiTohru en-aut-sei=Kuwaki en-aut-mei=Tohru kn-aut-name=桑木亨 kn-aut-sei=桑木 kn-aut-mei=亨 aut-affil-num=1 ORCID= en-aut-name=AkibaMasanori en-aut-sei=Akiba en-aut-mei=Masanori kn-aut-name=秋庭正典 kn-aut-sei=秋庭 kn-aut-mei=正典 aut-affil-num=2 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=3 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 en-keyword=FIA with gas-diffusion unit kn-keyword=FIA with gas-diffusion unit en-keyword=tubular microporous polytetrafluoroethylene kn-keyword=tubular microporous polytetrafluoroethylene en-keyword=determination of ammoniacal nitrogen kn-keyword=determination of ammoniacal nitrogen en-keyword=Thymol Blue kn-keyword=Thymol Blue END start-ver=1.4 cd-journal=joma no-vol=36 cd-vols= no-issue=6 article-no= start-page=343 end-page=347 dt-received= dt-revised= dt-accepted= dt-pub-year=1987 dt-pub=19870605 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Spectrophotometric determination of copper in steel, stainless steel and aluminium alloys by the solvent extraction of an ion associate of dichlorocopper(I) ion with Ethyl Violet kn-title=エチルバイオレットと銅(I)クロロ錯イオンのイオン会合抽出による鉄鋼及びアルミニウム合金中の銅の吸光光度定量 en-subtitle= kn-subtitle= en-abstract=Trace amounts of Cu in steel, stainless steel and aluminium alloys were spectrophotometrically determined after solvent extraction of an ion associate formed between dichlorocopper(I) ion (CuCl(2)(-)) and Ethyl Violet. The procedure is as follows. Dissolve the sample by heating with dilute sulfuric acid or aqua regia. Then, evaporate the resulting solution nearly to dryness. If aqua regia is used for dissolution of the sample, add dilute sulfuric acid to the resulting solution and evaporate nearly to dryness. Dilute the residue to a fixed volume with water. Pipette an adequate volume of the sample solution into a stoppered test tube. Add ascorbic acid and potassium chloride solutions, and adjust the pH of the solution to about 4.1 with acetate buffer. Add Ethyl Violet solution and extract the ion associate formed between dichlorocopper (I) ion and Ethyl Violet to 5 ml of toluene. Measure the absorbance of the organic phase at 612nm. The proposed method is very sensitive (molar absorptivity: 10(5) l mol(-1) cm(-1)) and the interference of coexisting ions is negligible. Copper above 0.011% in the sample can be determined by this method. kn-abstract=Cu(I)クロロ錯陰イオンとエチルバイオレットとのイオン会合体の溶媒抽出-吸光光度法による鉄鋼及びアルミニウム合金中のCuの定量方法を確立した.試料を希硫酸又は王水で溶解し,ほぼ蒸発乾固する.王水を使用した場合,更に希硫酸を加え,ほぼ蒸発乾固する.その後定容とし,試料溶液として用いる.この一定量を抽出管に取り,アスコルビン酸でCUを還元し,塩化物イオンの存在下,酢酸塩緩衝液でpH4.1付近に調整後,エチルバイオレット溶液を加え,生成したイオン会合体をトルエン相に抽出する.このトルエン相の612nmでの吸光度を測定し, Cuの定量を行う.本法は高感度(モル吸光係数約10(5)),高選択的,特にモル比でFeがCuの11000倍量共存しても妨害とはならず試料中の0.011%程度のCuの定量も可能であった. en-copyright= kn-copyright= en-aut-name=YamamotoKoichi en-aut-sei=Yamamoto en-aut-mei=Koichi kn-aut-name=山本幸市 kn-aut-sei=山本 kn-aut-mei=幸市 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=米子工業高等専門学校工業化学科 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=spectrophotometry of copper kn-keyword=spectrophotometry of copper en-keyword=solvent extraction of Cu (I) chloro complexes-Ethyl Violet ion associate kn-keyword=solvent extraction of Cu (I) chloro complexes-Ethyl Violet ion associate en-keyword=steel kn-keyword=steel en-keyword=stainless steel and aluminium alloys kn-keyword=stainless steel and aluminium alloys END start-ver=1.4 cd-journal=joma no-vol=36 cd-vols= no-issue=2 article-no= start-page=77 end-page=81 dt-received= dt-revised= dt-accepted= dt-pub-year=1987 dt-pub=19870205 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Comparison of separation efficiency of benzene carboxylate derivatives for the determination of chloride, sulfate and nitrate ions in river water by indirect photometric ion chromatography kn-title=間接吸光検出イオンクロマトグラフィーによる河川水中の塩化物イオン,硫酸イオン及び硝酸イオン定量のためのベンゼンカルボン酸誘導体の分離能の比較 en-subtitle= kn-subtitle= en-abstract=Rapid and sensitive determination of chloride, sulfate and nitrate ions in river water was achieved by ion chromatography with UV photometric detector. Comparison of elution ability of eluent ions was made by using phthalate, hemimellitate, trimellitate, trimesate and pyromellitate ions at pH 7.5. Trimellitate solution (1,2,4-benzenetricarboxylate, 4×10(-4) M) is superior to other eluent ions because of its strong light-absorption at longer wavelength beyond 250 nm, suitable ability of elution for chloride, sulfate and nitrate ions, low price, high purity and easy availability. An anion exchange column (TSK gel IC-Anion-PW, 4.6 mm i.d.×50 mm) was used. Twenty microliters of sample solution was injected and decrease in absorbance of the trimellitate eluent at 250300 nm was detected. The calibration curves were linear in the range of (0.810)×10(-4) M for chloride, (0.44)×10(-4) M for sulfate and (0.120)×10(-4) M for nitrate. By the proposed method, chloride, sulfate and nitrate in river water were determined within four min. The relative standard deviations of ten measurements of tap water were 0.35% for chloride, 0.56% for sulfate and 1.3% for nitrate, respectively. kn-abstract=吸光光度検出器を用いたイオンクロマトグラフィーによる河川水中の塩化物イオン,硫酸イオン及び硝酸イオンの分析を目的とし本研究を行った.溶離イオンとして,2価,3価及び4価のベンゼンカルボン酸誘導体を比較した.河川水に含まれる程度の塩化物,硫酸,硝酸イオンの定量のためにはトリメリテートイオン(1,2,4-ベンゼントリカルボン酸イオン)が有用であることが分かった.陰イオン交換カラム(TSK gel IC-Anion-PW,4.6mmi.d×50mm)を用いることにより,塩化物,硫酸,硝酸イオンを約4分で分離定量できた.検量線は塩化物イオン(0.8~10)×10(-4)M,硫酸イオン(4.4~4)×10(-4)M,硝酸イオン(0.1~20)×10(-4)Mの範囲で良好な直線となった.普通河川水中に存在する程度のイオソは定量を妨害しない.再現性は各イオンとも相対標準偏差で1.5%以内であった.検出限界は塩化物イオン0.1ppm,硫酸イオソ0.2ppm,硝酸イオン0.1ppmであった.実際試料(河川水,水道水)に応用し,満足のいく結果を得た. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=SawataniIkuo en-aut-sei=Sawatani en-aut-mei=Ikuo kn-aut-name=沢谷郁夫 kn-aut-sei=沢谷 kn-aut-mei=郁夫 aut-affil-num=2 ORCID= en-aut-name=HironakaTakashi en-aut-sei=Hironaka en-aut-mei=Takashi kn-aut-name=弘中孝志 kn-aut-sei=弘中 kn-aut-mei=孝志 aut-affil-num=3 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=4 ORCID= en-aut-name=ToeiKyoji en-aut-sei=Toei en-aut-mei=Kyoji kn-aut-name=桐栄恭二 kn-aut-sei=桐栄 kn-aut-mei=恭二 aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 affil-num=5 en-affil= kn-affil=岡山大学 en-keyword=ion chromatography with photometric detector kn-keyword=ion chromatography with photometric detector en-keyword=comparison of eluent ions kn-keyword=comparison of eluent ions en-keyword=elution with trimellitate solution kn-keyword=elution with trimellitate solution en-keyword=determination of chloride kn-keyword=determination of chloride END start-ver=1.4 cd-journal=joma no-vol=37 cd-vols= no-issue=10 article-no= start-page=554 end-page=557 dt-received= dt-revised= dt-accepted= dt-pub-year=1988 dt-pub=19881005 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Extraction/spectrophotometric determination of molybdenum(VI) with 4,6-di-t-buty1-3-methoxycatechol and Malachite Green kn-title=4,6-ジ-t-ブチル-3-メトキシカテコールとマラカイトグリーンを用いるモリブデン(VI)の抽出/吸光光度定量 en-subtitle= kn-subtitle= en-abstract=Mo(VI) forms an chelate anion with 4, 6-di-t-butyl-3-methoxycatechol (DBMC) and the ion asscoiate between the chelate anion and Malachite Green (MG) is extracted into toluene in the pH range from 1.8 to 3.5. DBMC was synthesized according to our previous work. The standard procedure was as follows: transfer a sample solution {Mo (VI) <4.8 μg} into a 25 ml test tube with stopper, and add 0.5 ml each of 5×10(-2) M sulfuric acid and 1.0×10(-3) M MG solution. If necessary, add masking agent solution (ascorbic acid and tartaric acid). After adding water to make up to 10 ml, add 5 ml of 1.5×10(-2) M DBMC toluene solution, then shake for 30 min. Measure the absorbance of the organic phase at 635 nm.Apparent molar absorptivity was 8.0×10(4) l mol(-1) cm(-1) and the absorbance of the reagent blank was 0.01. The relative standard deviation of 10 measurements of 1.92μg of Mo(VI) was 0.52%. The present method was applied to steel samples with satisfactory results. The effect of W(VI) coexisting at concentrations over 1×10(-6) M was corrected by the equations using apparent molar absorptivities of Mo(VI) and W(VI) obtained with or without the masking agent (2.5×10(-3) M tartaric acid). kn-abstract=Mo(VI)の高感度抽出/吸光光度定量法について検討を行った.pH1.8から3.5の範囲でMo(VI)と4,6-ジ-t-ブチル-3-メトキシカテコール(DBMC)は1価のキレート陰イオンを形成し,マラカイトグリーンとのイオン会合体としてトルエンに抽出される.吸収極大波長635nmでの見掛けのモル吸光係数は8.0×10(4) 1 mol(-1)cm(-1)であり,試薬から試験の吸光度は約0.01であった.又,Mo(VI)1.92μgでの10回繰り返し実験の相対標準偏差は0.52%であった.通常の金属イオンは定量を妨害しないが,W(VI)及びV(V)は2×10(-7)Mが共存許容濃度である.V(V)はアスコルビン酸を加えることにより2.5×10(-5)Mまで共存できる.W(VI)は酒石酸添加により10(-6)Mまでマスキングできたが,これ以上の濃度の場合には補正式を用いた.本法を鉄鋼試料中のMo(VI)の定量に応用し,満足な結果が得られた. en-copyright= kn-copyright= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=1 ORCID= en-aut-name=NishizakiYouko en-aut-sei=Nishizaki en-aut-mei=Youko kn-aut-name=西崎陽子 kn-aut-sei=西崎 kn-aut-mei=陽子 aut-affil-num=2 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=determination of Mo kn-keyword=determination of Mo en-keyword=4,6-di-t-butyl-3-methoxycatechol kn-keyword=4,6-di-t-butyl-3-methoxycatechol en-keyword=Malachite Green kn-keyword=Malachite Green en-keyword=extraction/spectrophotometry kn-keyword=extraction/spectrophotometry en-keyword=steel kn-keyword=steel END start-ver=1.4 cd-journal=joma no-vol=37 cd-vols= no-issue=10 article-no= start-page=T115 end-page=T119 dt-received= dt-revised= dt-accepted= dt-pub-year=1988 dt-pub=19881005 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=FIA for trace amounts of silicon based on spectrophotometric determination of molybdosilicic acid kn-title=モリブドケイ酸の吸光度測定に基づく微量ケイ素のフローインジェクション分析法 en-subtitle= kn-subtitle= en-abstract=Spectrophotometric determination of silicon based on the formation of molybdosilicic acid was examined by FIA. Two streams, a carrier and a reagent solution, were propelled at a flow rate of 0.7 ml min(-1) by a double-plunger micropump. Sample solution, 320 μl, was injected into the carrier (distilled water). The reagent solution comprised 0.006 M Mo(VI) and 0.075 M sulfuric acid. The reaction coil was 9 m long, and was heated in an air bath made of aluminium block and controlled at 100℃. Just behind the reaction coil, a cooling coil (0.5 mm i.d.×1 m), which was cooled in a water bath at 20°C, was incorporated. The molybdosilicic acid formed was detected at 350 nm by a UV-VIS detector. The calibration graph was linear over the range of silicon from 10 to 1000 ppb. The detection limit corresponding to a signal to noise ratio(S/N) of 3 was 2 ppb. The relative standard deviations for 6 determinations of 10 ppb and 60 ppb silicon were 4% and 0.5%, respectively. The sampling rate was 30 samples per hour. kn-abstract=ケイ酸(ケイ酸塩)の高感度定量法を目的としてFIA法を検討した.検出法として,モリブドケイ酸の350nmの吸光度測定法を採用した.試料溶液(モリブデン酸アンモニウムを含む希硫酸)の組成,反応コイル長,反応温度,測定波長,試料注入量,流速などの最適化により,高感度定量が可能になった.検量線はSi 10～1000ppbで良好な直線性を示した.検出限界(S/N=3)は2ppbであり相対標準偏差はSi 10ppb及び60ppbでそれぞれ4%及び0.5%であった.分析速度は毎時30サンプルであった. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=KorechikaKatsuhiko en-aut-sei=Korechika en-aut-mei=Katsuhiko kn-aut-name=是近勝彦 kn-aut-sei=是近 kn-aut-mei=勝彦 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=FIA for silicon kn-keyword=FIA for silicon en-keyword=spectrophotometric determination kn-keyword=spectrophotometric determination en-keyword=molybdosilicate kn-keyword=molybdosilicate END start-ver=1.4 cd-journal=joma no-vol=37 cd-vols= no-issue=6 article-no= start-page=296 end-page=300 dt-received= dt-revised= dt-accepted= dt-pub-year=1988 dt-pub=19880605 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Color-change behavior of tetrabromophenolphthalein ethyl ester in mixed solvents of chloroform and alcohols kn-title=クロロホルム-アルコール混合溶媒中におけるテトラブロモフェノールフタレインエチルエステルの発色挙動 en-subtitle= kn-subtitle= en-abstract=Color change of tetrabromophenolphthalein ethyl ester (TBPE·H) in several alcohols and their mixtures with chloroform was studied. TBPE·H shows maximum absorption at 430 nm in chloroform, while it shows the maximum absorption near 600 nm in mixed solvents of chloroform and alcohols. The absorption near 600 nm was considered to be due to ion-pair formation. The formation of the ion pair and its dissociation reaction are considered as follows. TBPE·H+(m+n)S K(i)⇄　TBPE(mS)(-)·H(nS)(+) TBPE(mS)(-)·H(nS)(+) K(d)⇄ TBPE(mS)(-)+H(nS)(+) where S is an alcohol. Ion-pair formation constants (K(i)) and dissociation constsnts (K(d)) were obtained using methanol, ethanol, propanol and butanol as solvation molecules by spectrophotometry and conductometry. The solvation numbers obtained were 3.3 to 4.7, and the values of log K(i) were -4.6 to -2.4. The values of log.K(d) obtained in pure alcohols were -7 to -6, which indicates that little dissociation occurs. kn-abstract=テトラブロモフェノールフタレインエチルエステル(TBPE・H)のアルコール及びアルコールとクロロホルム混合溶媒中における 600nm 付近の吸収の発現について考察した.TBPE・Hはクロロホルム中で403nmに吸収極大波長を持つが,アルコール(S)の存在下で600nm付近に新たに吸収を示す.これは次の反応によるイオン対の生成及び解離によるものである. TBPE・H+(m+n)SK(i)⇄TBPE(mS)(-)・H(nS)(+) TBPE(mS)-・H(nS)(+)K(d)⇄TBPE(mS)(-)+H(nS)(+) 吸光度測定,電気伝導度測定によりK(i),K(d)の値を求めた.Sとしてはメタノール,エタノール,プロパノール及びブタノールを用いて検討した.溶媒和数(m+n)は3.3～4.7であり,logK(i)値は -4.6～-2.4であった.純アルコール中のlogK(d)値は-7～-6であり,イオン解離している割合は非常に小さいことが分かった. en-copyright= kn-copyright= en-aut-name=HosoiYasuhiro en-aut-sei=Hosoi en-aut-mei=Yasuhiro kn-aut-name=細井康宏 kn-aut-sei=細井 kn-aut-mei=康宏 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=Ion-pair formation and dissociation of tetrabromophenolphthalein ethyl ester kn-keyword=Ion-pair formation and dissociation of tetrabromophenolphthalein ethyl ester en-keyword=solvation of alcohols kn-keyword=solvation of alcohols en-keyword=mixed solvents of chloroform and alcohols kn-keyword=mixed solvents of chloroform and alcohols en-keyword=spectro photometric and conductometric studies kn-keyword=spectro photometric and conductometric studies END start-ver=1.4 cd-journal=joma no-vol=37 cd-vols= no-issue=6 article-no= start-page=301 end-page=305 dt-received= dt-revised= dt-accepted= dt-pub-year=1988 dt-pub=19880605 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Spectrophotometric determination of ethanol based on coloration of tetrabromophenolphthalein ethyl ester in water-alcohol mixed solvent kn-title=水-アルコール混合溶媒中におけるテトラブロモフェノールフタレインエチルエステルの発色に基づくエタノールの吸光光度定量 en-subtitle= kn-subtitle= en-abstract=In a weak acidic solution an acidic triphenylmethane dye, tetrabromophenolphtalein ethyl ester, exists in the protonated form, TBPE·H, which precipitated as a yellow solid. TBPE·H, however, dissolves in an acidic solution in the presence of a non-ionic surfactant, such as Triton X-100, and the TBPE·H solution turns blue (λ(max)=590 nm) on adding alcohols, such as methanol, ethanol, propanol and butanol. This color change was used to determine the ethanol content in alcoholic liquors. The calibration curve was not a straight line. The determinable range was from 2 to 10% (v/v) (final concentration). Alcoholic liquors (sake, whisky, shochu) were used for the determination after pretreatment with activated, carbon. This color change reaction was applied to FIA; it made it possible to analyse 45 samples per hour without pretreatment with activated carbon. kn-abstract=トリフェニルメタン系酸性色素のテトラブロモフェノールフタレインエチルエステル(TBPE)は水溶液中,弱酸性条件下で酸型TBPE・Hの黄色沈殿を生じる.しかし非イオン性界面活性剤Triton X-100の共存により,TBPE・Hは可溶化する.そこヘアルコールを加えると,解離型のTBPE-の生成による青色(λ(max)=590nm)を発する.この発色反応を酒類中のエタノールの定量に利用した.検量線は直線とはならないが,定量可能範囲は最終濃度で1～10% (v/v)であった.実際試料(清酒,ウイスキー,しょうちゅう)では,活性炭により前処理をした後定量に用いた.本発色系はFIAにも応用され,その場合前処理は必要なく,毎時45サンプルの測定が可能であった. en-copyright= kn-copyright= en-aut-name=HosoiYasuhiro en-aut-sei=Hosoi en-aut-mei=Yasuhiro kn-aut-name=細井康宏 kn-aut-sei=細井 kn-aut-mei=康宏 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=Spectrophotometric determination of ethanol kn-keyword=Spectrophotometric determination of ethanol en-keyword=FIA kn-keyword=FIA en-keyword=tetrabromophenolphthalein ethyl ester kn-keyword=tetrabromophenolphthalein ethyl ester en-keyword=non-ionic surfactant Triton X-100 kn-keyword=non-ionic surfactant Triton X-100 en-keyword=alcoholic liquors kn-keyword=alcoholic liquors END start-ver=1.4 cd-journal=joma no-vol=37 cd-vols= no-issue=12 article-no= start-page=642 end-page=647 dt-received= dt-revised= dt-accepted= dt-pub-year=1988 dt-pub=19881205 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Spectrophotometric determination of sodium and potassium by FIA coupled with separation on a silica column and solvent extraction kn-title=カラム分離/溶媒抽出フローインジェクション分析法によるナトリウムとカリウムの吸光光度法 en-subtitle= kn-subtitle= en-abstract=Sodium and potassium ions were spectrophotometrically determined by solvent extraction flow injection incorporated with a silica gel column. The ion association complexes which formed between alkali metal-crown ether complexes and an anionic dye were extracted into an organic phase and the absorbance of the organic phase was measured after the phase separation by a phase separator with a poly(tetrafluoroethylene) porous membrane (pore size: 0.8 μm). Sodium and potassium were separated on a silica gel column (1 mm i.d.×20 cm; 100200 mesh silica gel). Four streams, a carrier, an eluent, a reagent solution and an extraction solvent, were propelled at the flow rate of 0.8 ml min(-1) The carrier was distilled water. The eluent contained 10(-2) M lithium acetate and 5×10(-3) M benzo-18-crown-6 (B18C6), and the reagent solution consisted of 5×10(-4) M 4-diethylamino-2, 5-dichloroazobenzene-4-sulfonate, 5×10(-3) M B18C6, 10(-3)M EDTA (dilithium salt) and 3×10(-3) M lithium hydroxide. The extraction solvent was a mixture of benzene and chlorobenzene (1+1). The absorbance was continuously measured at 450 nm with a 8 μl flow cell (path length: 10 mm). Calibration curves for sodium and potassium were linear in the range from 1×10(-4) M to 2×10(-3) M and from 5×10(-6) M to 1×10(-4) M, respectively. The sampling rate was about 20 samples per hour. kn-abstract=シリカゲルカラムによるNa(+)とK(+)の分離及びクラウン錯体の陰イオン染料とのイオン会合体の溶媒抽出を組み込んだFIAによる吸光光度法を検討した.内経1mm,長さ20cmのPTFEチューブに100～200メッシュのシリカゲルを詰めたカラムを用いた.溶離液として,5×10(-3)Mベンゾ-18-クラウン-6及び,10(-2)M酢酸リチウムを含む水溶液を用いた.分析イオンを含む溶出液は試薬溶液(5×10(-4)Mの4'-ジエチルアミノ-2,5-ジクロロアゾベンゼン-4-スルホン酸イオン,5×10(-3)Mのベンゾ-18-クラウン-6,10(-3)MのEDTA及び3×10(-3)Mの水酸化リチウムを含む)と混合され,T字型セグメンターで抽出溶媒(ベンゼン+クロロベンゼン=1+1)と合流し,抽出コイル中で抽出が行われた.ポリテトラフルオロエチレン膜を備えた相分離器により,有機相は分離され,8μlのフローセルで450nmの吸光度が測定された.1×10(-4)M～2×10(-3)MのNa(+),5×10(-6)M～1×10(-4)MのK(+)に対して,検量線は直線となった. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=YonedaNaomi en-aut-sei=Yoneda en-aut-mei=Naomi kn-aut-name=米田直生 kn-aut-sei=米田 kn-aut-mei=直生 aut-affil-num=2 ORCID= en-aut-name=IwachidoTadashi en-aut-sei=Iwachido en-aut-mei=Tadashi kn-aut-name=岩知道正 kn-aut-sei=岩知道 kn-aut-mei=正 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=solvent extraction/FIA kn-keyword=solvent extraction/FIA en-keyword=silica-gel column separation kn-keyword=silica-gel column separation en-keyword=sodium and potassium determination kn-keyword=sodium and potassium determination en-keyword=benzo-18 crown-6 kn-keyword=benzo-18 crown-6 en-keyword=4'-diethylaminophenyl-2 kn-keyword=4'-diethylaminophenyl-2 END start-ver=1.4 cd-journal=joma no-vol=38 cd-vols= no-issue=9 article-no= start-page=T143 end-page=T148 dt-received= dt-revised= dt-accepted= dt-pub-year=1989 dt-pub=19890905 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=FIA of anionic surfactants using a double-line solvent extraction system kn-title=二流路系を用いた洗剤の溶媒抽出/フローインジェクション分析 en-subtitle= kn-subtitle= en-abstract=FIA of anionic surfactants was examined by using a double-line system in respect to practical application. A reagent solution and an extraction solvent were propelled by a double-plunger pump. Sample solutions were injected into a reagent solution stream, which was marged in a extraction solvent stream. An improved segmentor with an outlet of 0.25-mm bore and 13-μl space made smaller segments (averaged length, 2 mm), which enabled to have higher peaks. The efficiency of the smaller segments on the peak height was higher when the extraction tubing was shorter than 1 m. Three kinds of reagent solutions were examined ; one comprised 1-methyl-4-(4-diethylaminophenylazo) pyridinium (MEP) chloride (extraction solvent, chloroform ; MEP · Cl method), another an iodide of MEP (extraction solvent, chloroform ; MEP· I method) and the other methylene blue (extraction solvent, ο-dichlorobenzene ; MB method). By the MEP· I method, negative peaks were obtained in the range below 10(-6) M of anionic surfactants. The highest peaks were obtained by the MB method. The peak height, the standard deviation and the relative standard deviation obtained by 10 times injection of 10(-6) M laurylsulfate (LS(-)) were 200.6 mm, 0.8 mm and 0.4%, respectively, by the MB method ; 121.1 mm, 0.3 mm and 0.3%, respectively, by the MEP·Cl method. The detection limit corresponding to a signal to noise ratio (S/N) of 3 was about 1 × 10(-8) M of LS- by the MB and MEP·Cl methods. This method was capable of analyzing 2030 samples per hour. kn-abstract=洗剤(陰イオン界面活性剤)の抽出/FIAについて,実用分析の観点から,装置面と試薬面について再検討した.プランジャー型ポンプを用い,従来の三流路系を二流路系とし,試薬溶液流れに試料を注入した.ポンプについて検討したところ,ダブルプランジャー型ポンプ1台で間に合い,三流路法と比較しても,感度的にはほぼ同程度であることが分かった.内径0.5mm,長さ1m以上のポリテトラフルオロエチレン製チューブを抽出コイルとして用いたとき,長さ25mmと約2mmのセグメントにおいてピーク高さはほとんど同じであった.陰イオン界面活性剤の対イオンとなる染料陽イオンについては,メチレンブルー(MB)(抽出溶媒:ο-ジクロロベンゼン)と1-メチル-4-(4-ジエチルアミノフェニルアゾ)ピリジニウムイオン(MEP)(抽出溶媒:クロロホルム)を比較した.二つの染料陽イオンを比較すると,MB法のほうが感度は高いが,試薬から試験液のピークが負ピークとなり,又ピークのテイリングが大きいため,分析所要時間が若干長い.1×10(-6)Mラウリル硫酸ナトリウムを10回注入したときのピーク高さ,標準偏差及び相対標準偏差はMB法でそれぞれ,200.6mm,0.8mm及び0.4%,MEP法でそれぞれ,121.1mm,0.3mm及び0.3%であった.S/N=3に相当する検出限界は両法において約1×10(-8)Mであるが,実際の定量下限は3×10(-8)M程度となる.分析所要時間は,1サンプル当たりMEP法で2分,MB法で3分(流量0.6ml min(-1)の場合)及びメチレンブルー法で2分(流量0.8ml min(-1)の場合)となる. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=KorechikaKatsuhiko en-aut-sei=Korechika en-aut-mei=Katsuhiko kn-aut-name=是近勝彦 kn-aut-sei=是近 kn-aut-mei=勝彦 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=solvent extraction/FIA kn-keyword=solvent extraction/FIA en-keyword=anionic surfactants determination kn-keyword=anionic surfactants determination en-keyword=methylene blue as an counter ion kn-keyword=methylene blue as an counter ion en-keyword=1-methyl-4-(4-diethylaminophenylazo)pyridinium as an counter ion kn-keyword=1-methyl-4-(4-diethylaminophenylazo)pyridinium as an counter ion END start-ver=1.4 cd-journal=joma no-vol=38 cd-vols= no-issue=4 article-no= start-page=147 end-page=170 dt-received= dt-revised= dt-accepted= dt-pub-year=1989 dt-pub=19890405 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Design of useful methods for separation and analysis based on ion association reactions kn-title=イオン会合を利用する分離・分析法の設計 en-subtitle= kn-subtitle= en-abstract=Methods for the separation and analysis of ionic and nonionic species based on ion association reactions were developed. A concept for ion association reactions and ion association reagents was proposed. The ion association reactions may be divided into two categories : an electrostatic interaction-induced ion association and a hydrophobic interaction-induced ion association. The latter ion association reaction has been often used in solvent extraction procedures. The effect of extraction solvents on the extractability of ion association complexes was examined : the differences in the extraction constant (log K(ex)) between two extraction solvents were almost equal in various ion association complexes. The difference in log K(ex) between the standard solvent (carbontet-rachloride) and a given solvent may be defined as S(ex) : a parameter for the extraction ability of a solvent for an ion association complex. The extraction constant was divided into two parameters, C and A, assigned to the cation and anion; thus log K(ex)= C + A. A method for estimating C and A was proposed. By using log K(ex) predicted or experimentally obtained, novel solvent extraction/spectrophotometrical methods were designed and used in practical analysis, for example, in the determination of anionic surfactants, alkaline metals and other metal ions, phosphorus, arsenic and silicon, boron, and organic ionic species. Applications of ion association reactions to analytical use in an aqueous medium were developed. One was based on the solubilization of ion association complexes, and the other on the micelle extraction of ion association complexes. Chromatographic separations and determination of chelate anions were also mentioned. kn-abstract=イオン会合を利用する新しい分離法と分析法の開発に関する研究を行った.イオン会合の概念をより明確にするための基礎検討を行い,イオン会合のしやすさ,抽出のされやすさについて考察した.イオン会合の様式を静電引力型と疎水構造型に分け,それぞれ静電引力型イオン会合性試薬と疎水構造型イオン会合性試薬を対応させた.疎水構造型イオン会合性試薬を用いる抽出分離法において,イオン会合体の抽出性に及ぼす抽出溶媒の影響,イオン会合性試薬の影響について検討し,それらを基に抽出定数(log K(ex))の推算法について考察した.四塩化炭素を基準にした場合の溶媒の抽出能(イオン会合体の抽出のしやすさ)はE(T)値と良好な直線関係を示す.抽出定数はlog K(ex)=C+A(C:対陽イオンの抽出性の尺度,A:対陰イオンの抽出性の尺度)で表されるものとし,各種陽,陰イオンのC値,A値を決定した.又イオン骨格と置換基の寄与(π値)を用いるC値,A値の概算法も示した.log K(ex)を推算し,あるいは実測値を用いて,新しい抽出分離法と吸光光度法を設計し,実際にも有用な方法多数を開発した.溶媒抽出を用いない方法についても検討した.水溶液での疎水構造型イオン会合体生成に基づく新規定量法として,酸-塩基反応を伴う吸光光度法2方法を検討した.一つはイオン会合体の可溶化現象を用いるもので,リン,ケイ素の定量例が示された.もう一つはイオン会合体のミセル抽出現象を用いるもので,アルキルアミン,第四級アンモニウムイオンについての検討例を示した.更に,イオン会合の概念が適用できる例として,逆相分配クロマトグラフィー及びイオン交換クロマトグラフィーによる疎水構造型イオンの分離定量例も示した. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 en-keyword=ion association reaction kn-keyword=ion association reaction en-keyword=electrostatic interaction and hydrophobic interaction induced ion association kn-keyword=electrostatic interaction and hydrophobic interaction induced ion association en-keyword=hydrophobic-interaction ion association reagent kn-keyword=hydrophobic-interaction ion association reagent en-keyword=parameter for solvent extraction ability kn-keyword=parameter for solvent extraction ability en-keyword=parameter for extractability of cations and anions kn-keyword=parameter for extractability of cations and anions en-keyword=prediction of extraction constants kn-keyword=prediction of extraction constants en-keyword=design of solvent extraction/spectrophotometry kn-keyword=design of solvent extraction/spectrophotometry en-keyword=solubilization of ion association complexes kn-keyword=solubilization of ion association complexes en-keyword=micelle extraction of ion association kn-keyword=micelle extraction of ion association en-keyword=chromatography of chelate anions kn-keyword=chromatography of chelate anions END start-ver=1.4 cd-journal=joma no-vol=38 cd-vols= no-issue=5 article-no= start-page=211 end-page=214 dt-received= dt-revised= dt-accepted= dt-pub-year=1989 dt-pub=19890505 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Extractability of ion-associates fromed between organic onium ions and tetrabromophenolphthalein ethyl ester anion into a mixed micelle kn-title=有機オニウムイオン-テトラブロモフェノールフタレインエチルエステル陰イオンのイオン会合体のミセル抽出 en-subtitle= kn-subtitle= en-abstract=Tetrabromophenolphthalein ethyl ester (TBPE·H) forms the mixed micelle (TBPE·H + nTX-100)(m) with Triton X-100 (TX-100) at pH 4. If a hydrophobic organic onium ion (C(+)) exists together, it forms an ion associate (C(+)·TBPE(-)), and dissolves into the micelle (micelle extraction of ion associates). The equilibrium of micelle extraction is expressed as follows, (TBPE·H + nTX-100)(m) + C(+) ⇄ (C(+)·TBPE + nTX-100)(m) + H +(n≒10). In this work, the equilibrium of the micelle extraction of several organic onium ions, such as amines, ammonium ions, phoshonium ions, arsonium ion with various alkyl and/or aryl groups were investigated. The extractability of ion-associates into the micelle showed a good correlation with the extractability of ion associates into chloroform. kn-abstract=テトラブロモフェノールフタレインエチルエステル(TBPE・H)はpH4でTritonX-100(TX-100)と混合ミセル(TBPE・H+nTX-100)(m)を形成している.これに,疎水性の有機オニウムイオン(C(+))が加えられると(C(+)・TBPE(-))のイオン会合体が生成され,ミセルに可溶化する(イオン会合体のミセル抽出).ミセル抽出の平衡は式,(TBPE・H+nTX-100)(m)+C(+)⇄(C(+)・TBPE(-)+nTX-100)(m)+H(+),(n≒10)に従うものとし,各種アルキル基を持つアミン,アンモニウムイオン,ホスホニウムイオン,アルソニウムイオンなどのオニウムイオンについて,ミセル抽出平衡を検討した.オニウムイオンのミセル抽出性は水-クロロホルム系における抽出性と良い相関を示すことが分かった. en-copyright= kn-copyright= en-aut-name=HosoiYasuhiro en-aut-sei=Hosoi en-aut-mei=Yasuhiro kn-aut-name=細井康宏 kn-aut-sei=細井 kn-aut-mei=康宏 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=micelle extraction of ion associates kn-keyword=micelle extraction of ion associates en-keyword=ion associates of organic onium ions with tetrabromophenolphthalein ethyl ester kn-keyword=ion associates of organic onium ions with tetrabromophenolphthalein ethyl ester en-keyword=equilibrium constants of micelle extraction of ion associates kn-keyword=equilibrium constants of micelle extraction of ion associates en-keyword=non-ionic surfactant Triton X-100 kn-keyword=non-ionic surfactant Triton X-100 END start-ver=1.4 cd-journal=joma no-vol=38 cd-vols= no-issue=5 article-no= start-page=205 end-page=210 dt-received= dt-revised= dt-accepted= dt-pub-year=1989 dt-pub=19890505 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Spectrophotometric determination of quaternary ammonium ions based on micelle extraction of ion associates kn-title=イオン会合体のミセル抽出に基づくアルキルアンモニウムイオンの吸光光度法 en-subtitle= kn-subtitle= en-abstract=In the presence of non-ionic surfactant, Triton X-100 {TX-100; 0.01 % (v/v)}, protonated tetrabromophenolphthalein ethyl ester (TBPE·H, λ(max) =430 nm) reacts with alkylammonium ions (quaternary ammonium ion : C(+)) to from ion associates (C(+)·TBPE, λ(max)=600～610 nm). This reaction is considered to be the change from a mixed micelle of TBPE·H and TX-100, (TBPE·H + nTX-100)(m), to a mixed micelle of the ion associate and TX-100, (C(+)・TBPE(-) + nTX-100)(m): namely, the micelle extraction of ion associates. The coloration system based on the micelle extraction was applied to the spectrophotometric determination of alkylammonium ions by a batchwise method and a flow injection method. kn-abstract=非イオン性界面活性剤のTriton X-100(TX-100;0.01% v/v)の存在下,テトラブロモフェノールフタレインエチルエステルの酸型(TBPE・H)とアルキルアンモニウムイオン(第四級アンモニウムイオン:C(+))は反応し,イオン会合体,(C(+)・TBPE(-)),を生成する.この反応は,TBPE・HとTX-100との混合ミセル(TBPE・H+nTX-100)(m)から,イオン会合体とTX-100との混合ミセル(C(+)・TBPE(-)+nTX-100)(m)への変化,すなわちイオン会合体のミセル抽出によるものとした.本ミセル抽出-発色系はアルキルアンモニウムイオンの吸光光度定量に応用でき,FIAに適用すれば,溶媒抽出を用いない簡便な方法となることが分かった. en-copyright= kn-copyright= en-aut-name=HosoiYasuhiro en-aut-sei=Hosoi en-aut-mei=Yasuhiro kn-aut-name=細井康宏 kn-aut-sei=細井 kn-aut-mei=康宏 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=micelle extraction of ion associates kn-keyword=micelle extraction of ion associates en-keyword=spectrophotometry of alkylammonium ions with tetrabromophenolphthalein ethyl ester kn-keyword=spectrophotometry of alkylammonium ions with tetrabromophenolphthalein ethyl ester en-keyword=FIA kn-keyword=FIA en-keyword=non-ionic surfactant Triton X-100 kn-keyword=non-ionic surfactant Triton X-100 END start-ver=1.4 cd-journal=joma no-vol=38 cd-vols= no-issue=3 article-no= start-page=103 end-page=108 dt-received= dt-revised= dt-accepted= dt-pub-year=1989 dt-pub=19890305 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Spectrophotometric determination of copper with iodide ion and Crystal Violet kn-title=ヨウ化物イオンとクリスタルバイオレットを用いる銅の吸光光度定量 en-subtitle= kn-subtitle= en-abstract=A method for spectrophotometric determination of micro amounts of copper with iodide ion and Crystal Violet (CV) was developed. The method is based on the formation of triiodide ion by the oxidative reaction of iodide ion with copper(II) in dilute sulfuric acid solution and the extraction of triiodide ion into toluene as an ion association complex with CV. The main extracted species is expected to be an ion association complex, CV(+)I(-)(3) copper(II) acts as a catalyst. The recommended procedure is as follows. Take a sample solution containing copper(II) up to 1.6 μg into a 25-ml stoppered test tube. Add 1 ml of 0.46 M sodium iodide solution, 1 ml of 0.5 M sulfuric acid solution and 1 ml of 3.2×10(-4)M CV solution, and dilute the solution to 10 ml with distilled water. Shake the mixture with 5 ml of toluene for 8 min. After the phase separation, measure the absorbance of the organic phase at 607 nm against the reagent blank. The calibration graph shows linearity up to 2.5×10(-6) M of copper(II) in the aqueous phase, and the apparent molar absorptivity is 1.7×10(5)1 mol(-1) cm(-1). Small amounts of oxidizing and reducing agents such as Fe(III), Cr(III) and Co(II) interfered with the determination. The present method is very simple and has a high sensitivity. kn-abstract=硫酸酸性溶液中でCu(2+)に対して過剰のI(-)が存在すると,I(-)は酸化されて三ヨウ化物イオン(I(-)(3))となり,Cu(2+)はジヨード銅(I)酸イオン(CuI(-)(2))となる.生成したI(-)(3),CuI(-)(2)はクリスタルバイオレット(CV(+))の存在下でイオン会合体となり,トルエンに抽出される.このトルエン相の607nmにおける吸光度を測定すれば,銅を定量することができる.検量線より算出した見掛けのモル吸光係数は1.7×10(5)1 mol(-1)cm(-1)であった.Fc(III),Cr(III),Co(II)などの酸化性及び還元性物質の共存は定量を妨害するが,その他多くのイオンは多量共存しても妨害とはならない.更に抽出化学種について検討した結果,主な抽出種はI(-)(3)とCV(+)の1:1のイオン会合体であり,大部分の銅イオンは水相に残っていることを確認した.これらのことから,本抽出系では銅(II)イオンは触媒的作用をしているものと結論された. en-copyright= kn-copyright= en-aut-name=YamamotoKoichi en-aut-sei=Yamamoto en-aut-mei=Koichi kn-aut-name=山本幸市 kn-aut-sei=山本 kn-aut-mei=幸市 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=米子工業高等専門学校工業化学科 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=spectrophotometric dtermination of copper with iodide ion and Crystal Violet kn-keyword=spectrophotometric dtermination of copper with iodide ion and Crystal Violet en-keyword=extraction of ion association complex into toluene kn-keyword=extraction of ion association complex into toluene END start-ver=1.4 cd-journal=joma no-vol=39 cd-vols= no-issue=7 article-no= start-page=393 end-page=397 dt-received= dt-revised= dt-accepted= dt-pub-year=1990 dt-pub=19900705 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Spectrophotometric method for anionic surfactants on the basis of color change of Bromocresol Purple with a quaternary ammonium ion kn-title=酸性染料ブロモクレゾールパープルと第四級アンモニウムイオンの変色反応を利用する陰イオン界面活性剤の吸光光度法 en-subtitle= kn-subtitle= en-abstract=A method for spectrophotometric determination of anionic surfactants with Bromocresol Purple (BCP) and cetyldimethylbenzylammonium ion (CDMBA(+)) was developed. The addition of CDMBA(+) to BCP solution buffered at pH 8 leads to a decrease in the absorbance at 588 nm. When anionic surfactants are added to the solution, the absorbance at 588 nm increases with increasing amounts of anioic surfactants. This increase in absorbance is caused by an ion association of CDMBA(+) with anionic surfactants. On the basis of this principle, the simple spectrophotometric method for the determination of anionic surfactants was developed. The recommended procedure is as follows: Pipet an adequate amount of a sample solution containing anionic surfactants up to 1.7×10(-5) M into a 10-ml volumetric flask. Add 0.5 ml of 4×10(-4) M CDMBA solution, 1 ml of 1.7×10(-4) M BCP solution and 0.5 ml of 0.2 M phosphate buffer solution(pH 8.1). Mix thoroughly and dilute to the mark with distilled water. Measure the absorbance of the solution at 588 nm against the reagent blank. The calibration graph shows linearity up to 1.7×10(-5) M of anionic surfactants and the apparent molar absorptivity is about 6×10(4) l mol(-1) cm(-1). This proposed method is very simple and there is minimal interference from coexisting anions. The method also can be applied to the determination of anionic surfactants by a visual method. kn-abstract=水溶液中で第四級アンモニウムイオン(セチルジメチルベンジルアンモニウムイオン=CDMBA+)の酸性染料(ブロモクレゾールパープル:BCP)に及ぼす変色反応を利用する陰イオン界面活性剤(ドデシル硫酸ナトリウム:Na・LS)の吸光光度定量法を開発した.CDMBA(+)はpH8付近でBCPと反応し,588nmでの吸光度を低下させる.又CDMBA(+)はLS(-)と安定なイオン会合体を形成する.従って一定量のCDMBA(+)の存在下では,LS(-)量の増加に伴い588nmでの吸光度は増大する.この原理による陰イオン界面活性剤の吸光光度法での検量線は0～1.7×10(-5)Mの濃度範囲でベールの法則に従い,直線の傾きから求めたモル吸光係数は約6×10(4)l mol(-1)cm(-1)であった.本法は溶媒抽出法に比べ,共存イオン特にかさ高い陰イオンの影響が小さい操作の簡便な定量法であり,陰イオン界面活性剤1～2ppmに対する視覚分析法としても用いることができる. en-copyright= kn-copyright= en-aut-name=YamamotoKoichi en-aut-sei=Yamamoto en-aut-mei=Koichi kn-aut-name=山本幸市 kn-aut-sei=山本 kn-aut-mei=幸市 aut-affil-num=1 ORCID= en-aut-name=IkeharaKoji en-aut-sei=Ikehara en-aut-mei=Koji kn-aut-name=池原宏治 kn-aut-sei=池原 kn-aut-mei=宏治 aut-affil-num=2 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=米子工業高等専門学校工業化学科 affil-num=2 en-affil= kn-affil=米子工業高等専門学校工業化学科 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=spectrophotometry kn-keyword=spectrophotometry en-keyword=anionic surfactant kn-keyword=anionic surfactant en-keyword=Bromocresol Purple kn-keyword=Bromocresol Purple en-keyword=ion association of cetyldimethylbenzylammonium ion with anionic surfactants kn-keyword=ion association of cetyldimethylbenzylammonium ion with anionic surfactants END start-ver=1.4 cd-journal=joma no-vol=39 cd-vols= no-issue=4 article-no= start-page=201 end-page=205 dt-received= dt-revised= dt-accepted= dt-pub-year=1990 dt-pub=19900405 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Color change behavior of water soluble azo-dye ions in a water-organic solvent mixed medium and its application to a spectrophotometric method for the determination of ethanol kn-title=水溶性アゾ染料イオンの水-有機溶媒混合媒体中における光吸収変化とエタノールの吸光光度定量への応用 en-subtitle= kn-subtitle= en-abstract=Solvent effects on the absorption spectra of water soluble azo-dye ions were investigated. Three types of azo-dyes (Type I, II and III) were used: Type I consists of 4-(4-dialkylaminophenylazo)benzene sulfonate ions (alkyl: methyl, ethyl, propyl and butyl groups), Type II, of 1-alkyl-4-(4-diethylaminophenylazo) pyridinium ions (alkyl: methyl, ethyl and propyl groups) and Type III, of N, N, N-trimethyl-p-phenylazoanilinium ion and its nitro derivative. Of these three types, the Type I dyes showed the most remarkable change in absorption spectrum. The absorption maximum wavelength decreased with increasing alcohol content: the more hydrophilic the dye ion and the alcohol, the greater was the blue shift of the absorption spectrum. This remarkable blue shift is attributed to a change in the contributions of the following resonance forms: R(2)(+)N_??_=N-N-_??_-SO(3)(-)(A) ↔ R(2)N-_??_-N=N-_??_-SO(3)(-)(B) With an increasing alcohol concentration or hydrophobicity around the dye ion, the contribution of the cationic form (A) decreases. By measuring the change in Propyl Orange absorbance at 420 nm, ethanol can be determined. The absorptiometric method of ethanol determination with Propyl Orange was applied to the flow injection procedure. kn-abstract=3種類の水溶性アゾ染料(陰イオン染料と2種類の陽イオン染料)の光吸収変化を水-アルコール混合溶媒中で調べた.最も大きな光吸収変化を示す染料はメチルオレンジ系染料であり,アルコール含量の増加と共に,吸収極大波長はブルーシフトし,短波長測の吸光度が増大する.なかでも,疎水性の大きい基をもつブチルオレンジが最も鋭敏な吸光度変化を示す.この吸収変化は,染料イオンの周りの微細環境が親水性場から疎水性場へ変化することによるものであり,親水性場では次式の(A)の極限構造をとりやすく,疎水性場では(B)の構造をとりやすいためと考えられる. R(2)(+)N〓=N-N-〓-SO(3)(-)(A) ↔ R(2)N-〓-N=N-〓-SO(3)(-)(B) 分析的応用としては,長波長側の吸光度減少,短波長側の吸光度増加を利用すればアルコールの定量が可能である.プロピルオレンジを用い,420nmの吸光度の増加を利用するエタノールの定量法がFIA法へ応用された. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=HosoiYasuhiro en-aut-sei=Hosoi en-aut-mei=Yasuhiro kn-aut-name=細井康宏 kn-aut-sei=細井 kn-aut-mei=康宏 aut-affil-num=2 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=color change behavior of water-soluble dyes kn-keyword=color change behavior of water-soluble dyes en-keyword=anionic and cationic azo-dyes kn-keyword=anionic and cationic azo-dyes en-keyword=spectrophotometry of alcohol kn-keyword=spectrophotometry of alcohol en-keyword=FIA kn-keyword=FIA END start-ver=1.4 cd-journal=joma no-vol=40 cd-vols= no-issue=8 article-no= start-page=401 end-page=405 dt-received= dt-revised= dt-accepted= dt-pub-year=1991 dt-pub=19910805 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Spectrophotometric determination of ethanol in water based on color change of Bromocresol Purple with a quaternary ammonium ion kn-title=ブロモクレゾールパープルと第四級アンモニウムイオンの変色反応を利用するエタノールの吸光光度定量 en-subtitle= kn-subtitle= en-abstract=In an aqueous solution buffered at pH 8, Bromocresol Purple reacts with a quaternary ammonium ion containing a long-chain alkyl group to change color from blue to light yellow. This color change, however, is inhibited in the presence of alcohols such as methanol, ethanol, propanol and butanol. This phenomenon was used to determine ethanol content in aqueous solutions. The calibration curve obtained by the batchwise manual method was not a straight line. In the FIA method, a linear relationship between the peak heights and the ethanol concentrations was obtained up to 60 v/v% of ethanol, and the relative standard deviations were 1.5 and 0.2% for the determinations (n = 5) of 4 and 20 v/v% of ethanol, respectively. FIA made it possible to analyze about 35 samples per hour. This proposed method can be used as a rapid and simple method for the determination of ethanol content in alcoholic liquors. kn-abstract=酸性染料ブロモクレゾールパープルはpH8付近の水溶液中,長鎖アルキル基を持つ第四級アンモニウムイオンと反応し,青色から淡黄色へと変化する.しかし,あらかじめアルコールが存在すると変色反応は阻害される.このことをエタノールの定量に利用した.検量線はバッチ法では直線とはならないが,FIA法では60%(v/v)まで直線、性を示した.FIA法においてエタノール4,20%(v/v)の5回の繰り返し実験の相対標準偏差はそれぞれ1.5%,0.2%であり,毎時約35サンプルの測定が可能であった.本法は酒類(しょうちゅう)中のエタノールの迅速・簡便な定量法として用いることができる. en-copyright= kn-copyright= en-aut-name=YamamotoKoichi en-aut-sei=Yamamoto en-aut-mei=Koichi kn-aut-name=山本幸市 kn-aut-sei=山本 kn-aut-mei=幸市 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=米子工業高等専門学校工業化学科 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=spectrophotometric determination of ethanol kn-keyword=spectrophotometric determination of ethanol en-keyword=FIA kn-keyword=FIA en-keyword=Bromocresol Purple kn-keyword=Bromocresol Purple en-keyword=quaternary ammonium ion kn-keyword=quaternary ammonium ion en-keyword=alcoholic liquors kn-keyword=alcoholic liquors END start-ver=1.4 cd-journal=joma no-vol=40 cd-vols= no-issue=7 article-no= start-page=355 end-page=360 dt-received= dt-revised= dt-accepted= dt-pub-year=1991 dt-pub=19910705 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Indirect photometric ion chromatography of inorganic anions, calcium and magnesium ions with 1, 5-naphthalenedisulfonate as an eluent kn-title=1,5-ナフタレンジスルホン酸イオンを溶離イオンとして用いる無機陰イオン及びカルシウム,マグネシウムイオンの間接吸光検出イオンクロマトグラフィー en-subtitle= kn-subtitle= en-abstract=Ion chromatography by indirect photometric detection was studied with 1,5-naphthalenedisulfonate (1,5-NDS) as an eluent ion. The advantages of 1,5-NDS are: (1) UV light absorption at longer wavelength near 300 nm, (2) adequate strength of elution ability for analysis of environmental waters, (3) little interference from pH change, and (4) stable, low cost and commercially available reagent. Chloride, nitrate and sulfate ions in river, spring and tap waters were determined with 4×10(-4) M 1,5-NDS by injecting 20 μl of sample solution. By injecting 100 μl of sample solution, these anions in rain water were determined with 2×10(-4) M eluent. When Ca(2+) and Mg(2+) coexist at concentrations above 10(-3) M, pretreatment with cartridge-type cation exchanger column is useful. Calcium(II) and manganese(II) ions were simultaneously determined with the other anions using the eluent containing 1×10(-4) M 1,5-NDS, 5×10(-5) M EDTA and 1×10(-4) M acetate buffer solution (pH 6). kn-abstract=溶離イオンとして1,5-ナフタレンジスルホン酸イオン(1,5-NDS)を用いる間接吸光検出イオンクロマトグラフィーによる無機陰イオン及びカルシウムイオン,マグネシウムイオンの同時定量法について検討した.1,5-NDSの主な利点は,(1)長波長側の300nm付近で高感度な定量が可能である,(2)溶離能が適度に強く,分離分析濃度範囲が環境水中の陰イオンの定量に適当である,(3)試料溶液のpHの影響を受けにくく,溶離液は広いpH範囲で使用できる,(4)試薬が安定であり,安価で入手しやすいなどである.又溶離液にEDTAを加えてCa(2+),Mg(2+)をキレート陰イオンとすることにより,無機陰イオンと同時定量が可能となった.本法により河川水,雨水中の無機陰イオン(Cl(-),NO(3)(-),SO(4)(2-))及びCa(2+),Mg(2+)の定量を行ったところ,良好な結果が得られた. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=2 ORCID= en-aut-name=HironakaTakashi en-aut-sei=Hironaka en-aut-mei=Takashi kn-aut-name=弘中孝志 kn-aut-sei=弘中 kn-aut-mei=孝志 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=indirect photometric ion chromatography kn-keyword=indirect photometric ion chromatography en-keyword=1,5-naphthalenedisulfonate kn-keyword=1,5-naphthalenedisulfonate en-keyword=determination of inorganic anions kn-keyword=determination of inorganic anions END start-ver=1.4 cd-journal=joma no-vol=40 cd-vols= no-issue=5 article-no= start-page=T107 end-page=T112 dt-received= dt-revised= dt-accepted= dt-pub-year=1991 dt-pub=19910505 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Spectrophotometric determination of sodium and potassium by FIA after separation on a cation exchanger column and solvent extraction kn-title=陽イオン交換カラム分離/溶媒抽出法を用いるナトリウム及びカリウムイオンのフローインジェクション吸光光度法 en-subtitle= kn-subtitle= en-abstract=Sodium and potassium ions were spectrophotometrically determined by a solvent extraction/flow injection method incorporated with a cation exchanger column. The ion association complexes which formed between alkali metal-crown ether complexes and anionic dye were extracted into an organic phase, and the absorbance of the organic phase was measured after the phase separation by a phase separator with poly (tetrafluoroethylene) porous membrane. The manifold was composed of three streams: 1. a carrier stream, 2. an eluent stream, and 3. an extraction solvent stream. The eluent contained 4×10(-3)M EDTA·3Li. The extraction solvent (1+1 mixture of benzene and chlorobenzene) contained 3×10(-3)M tetrabromophenolphthalein ethyl ester and 2×10(-3)M dicyclohexano-18-crown-6. Sodium and potassium ions were separated on a cation exchanger column (2.5mm i.d.×12mm). The eluent was made alkaline (pH 10) by passing through the anion exchanger membrane tubing which was kept in a 0.1M LiOH solution. The absorbance of the organic phase was measured at 615nm. Calibration graphs were linear up to 5×10(-4)M for Na(+) and 8×10(-5)M for K(+), respectively. The sample throughput was 12h(-1). The procedure was applicable to river and tap water samples. kn-abstract=Na(+), K(+)の溶媒抽出/吸光光度定量をFIAにより行った.両イオンの分離は低交換容量の陽イオン交換樹脂カラムにより行った.イオン交換樹脂は内径2.5mm,長さ12mmの樹脂製カラムに充てんして用いた.流れ系はキャリヤー,溶離液,抽出液の3流路を用い,試料はキャリヤーに注入した.キャリヤーは溶離液と合流し,カラムでNa(+)とK(+)は分離された.溶離液には4×10(-4)M EDTA・3Liを使用した.分析イオンを含む溶出液は,陰イオン交換膜チューブでアルカリ性となり,T字型セグメンターで有機相と合流し,抽出コイル内でNa(+), K(+)の抽出が行われた.有機相はイオン会合体形成用の染料陰イオンTBPE(テトラブロモフェノールフタレインエチルエステル)とクラウン化合物を含むベンゼン,クロロベンゼン(1+1)の混合溶媒である.ポリテトラフルオロエチレン膜を備えた相分離器により分離された有機相の吸光度は615nmで測定された. 5×10(-4)M以下のNa(+), 8×10(-5)M以下のK(+)に対して検量線は直線関係を示した.又本法による分析速度は毎時12試料であった. en-copyright= kn-copyright= en-aut-name=YoshidaKo en-aut-sei=Yoshida en-aut-mei=Ko kn-aut-name=吉田耕 kn-aut-sei=吉田 kn-aut-mei=耕 aut-affil-num=1 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=sodium and potassium determination kn-keyword=sodium and potassium determination en-keyword=spectrophotometry kn-keyword=spectrophotometry en-keyword=solvent extraction/flow injection analysis kn-keyword=solvent extraction/flow injection analysis en-keyword=cation exchanger column kn-keyword=cation exchanger column en-keyword=dicyclohexano-18-crown-6 kn-keyword=dicyclohexano-18-crown-6 en-keyword=tetrabromophenolphthalein ethyl ester kn-keyword=tetrabromophenolphthalein ethyl ester END start-ver=1.4 cd-journal=joma no-vol=42 cd-vols= no-issue=11 article-no= start-page=667 end-page=672 dt-received= dt-revised= dt-accepted= dt-pub-year=1993 dt-pub=19931105 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Group contribution study on ion-association extractability of ring-alkylated N-alkylpyridinium ions kn-title=2,3及び4位にアルキル置換基を持つN-アルキルピリジニウムイオンのイオン会合抽出性と抽出性に及ぼす置換基の寄与 en-subtitle= kn-subtitle= en-abstract=Twenty-six derivatives of alkyl-N-alkylpyridinium ions, where the alkyl groups were the methyl, ethyl and propyl groups, were synthesized. These pyridinium ions (C(+)) could be extracted into chloroform as their ion associates with Cl(2)-EO(-)(dichloro derivatives of Ethyl Orange, A(-) ), and thus each extraction constant K(ex)(=[C(+)・A-)] (o)/[C(+)][A(-)]) was obtained in this work. The longer the alkyl chains, the larger the values of log K(ex) were. The contribution of a methylene group to log K(ex) was on average 0.59 for alkyl groups substituted at a pyridine ring, and 0.54 for N-alkyl groups. The position effect (P(p)) was 0.11 and 0.28 for 3-substituted and 4-substituted derivatives, respectively. The overlapping effect (P(o)) occurred between an N-alkyl group and a 2-substituted group, and was estimated to be -0.20. P(o) must be considered for pairs of ethyl groups, and ethyl and propyl groups. The extractability parameter of the skelton (C(5)H(5)N(+)-) was determined to be an average 2.2, which is 0.75 smaller than the value of 2.95 (=0.59×5) calculated by using the contribution value of the methylene group, 0.59. This difference is almost the same as that in the benzene ring, 0.64, and is considered to be the effect of ring closure. kn-abstract=2,3,4位にアルキル基を持つN-アルキルピリジニウム塩(アルキル基:CH(3)-,C(2)H(5)-,C(3)H(7)-)26種を合成し,イオン会合抽出性について検討した.水-クロロホルム抽出系で,対イオンとしてエチルオレンジのジクロロ誘導体(Cl(2)-EO(-))を用いて抽出定数(logK(ex))を求めた.アルキル基の炭素数が増すと抽出性も増し,抽出定数への寄与分は2,3,4位の置換基では平均0.59,N-置換基では平均0.54であった.アルキル基が同じ場合には,抽出定数は4位>3位>2位置換体の順に小さくなる.2位置換体は隣接のN-置換基との重なり効果の結果,3,4位置換体よりも小さくなる.基本骨格(C(5)H(5)N(+)-)の抽出性の尺度(C:>N(+)<を基準C=0とする)は約2.2となり,メチレン基の数から単純計算した値(0.59×5=2.95)よりも0.75小さい.これはベンゼン環(-C(6)H(5))の単純計算値と実測値との差(0.64)とほぼ一致しており,閉環効果による抽出性(疎水性)の減少分と見なされる. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=2 ORCID= en-aut-name=YanHu en-aut-sei=Yan en-aut-mei=Hu kn-aut-name=胡焔 kn-aut-sei=胡 kn-aut-mei=焔 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=alkyl-N-alkylpyridinium derivatives kn-keyword=alkyl-N-alkylpyridinium derivatives en-keyword=dichloro derivatives of Ethyl Orange kn-keyword=dichloro derivatives of Ethyl Orange en-keyword=extractability of ion associates kn-keyword=extractability of ion associates en-keyword=contribution of substituents to extractability kn-keyword=contribution of substituents to extractability END start-ver=1.4 cd-journal=joma no-vol=42 cd-vols= no-issue=9 article-no= start-page=T123 end-page=T128 dt-received= dt-revised= dt-accepted= dt-pub-year=1993 dt-pub=19930905 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Assembly of a new gas-diffusion unit and its application to the determination of total carbonate and ammoniacal nitrogen by FIA. kn-title=新規ガス透過装置の試作とそれを用いるフローインジェクション分析法による天然水中の総炭酸及びアンモニア態窒素の吸光光度定量 en-subtitle= kn-subtitle= en-abstract=A new gas-diffusion unit was constructed and applied to determine total carbonate or ammoniacal nitrogen in water by spectrophotometric FIA. The gas diffusion unit, which was constructed without any glue, could be assembled easily by fastening the screws to tee connectors with ferrules. The new gas-diffusion unit was improved to decrease the dead volume. The unit gave sharper peaks than the previous one, and peaks higher by 10% in the case of CO(2) determination. The gas-diffusion part consisted of an inner microporous polytetrafluoroethylene (PTFE) tube (GORE-TEX®, 1.0 mm i.d., 1.8 mm o.d., pore size 2.0 μm, porosity 50%) and an outer PTFE tube (2.0 mm i.d., 3.0 mm o.d.). Sample solution was injected into the carrier solution (CS), in which the analyte was converted to a gaseous substance which passed through the microporous PTFE membrane to be mixed with the reagent solution (RS) flowing in the space between the outer and the inner tubings. The resulting pH shift caused the color of the indicator in RS to change. The conditions for the determination of total carbonate are as folows; CS was 1.8X×10(-3) mol dm(-3) H(2)SO(4), RS contained Cresol Red (at pH 9.0) and the detection wavelength was 410 nm. The detection limit was 0.96 mg dm(-3) CO(2) (S/N=3), the response was linear up to 172 mg dm(-3), and the sampling rate was 20 h(-1). For ammoniacal nitrogen, CS was 10(-2) mol dm(-3) NaOH, RS contained Cresol Red (pH 7.0) and absorbance was measured at 550 nm. The detection limit was 30μg dm(-3)NH(4)(+)-N (S/N=3), the response was linear up to 3.5 mg dm(-3), and the sampling rate was 30 h(-1). Total carbonate and ammoniacal nitrogen in river and seawater samples were determined satisfactorily. kn-abstract=今回新たに多孔質PTFE(polytetrafluoroethylene)チューブを分離膜とするガス透過装置を試作し,その性能について総炭酸定量用FIA装置を用いて検討した.新しいガス透過装置は組み立てが簡単で,前回製作のものに比べ,約10%の感度向上が達成され,更にピークのテイリングも減少した.本装置を組み込んだFIAにより環境水中の総炭酸,アンモニア態窒素の定量が可能である.いずれの場合もpH変化に伴うクレゾールレッドの呈色変化を測定に利用した.本法によれば多孔質ガス透過チューブ長8cmのとき,172mg dm(-3)(4×10(-3)mol dm(-3))以下の総炭酸を1時間当たり20試料,3.6mg dm(-3)(2.6×10(-4)mol dm(-3))以下のアンモニア態窒素を1時間当たり30試料の速さで測定できた.この際の検出限界(S/N=3に相当)は総炭酸の場合,0.96mg dm(-3)(2×10(-5)mol dm(-3)),アンモニア態窒素の場合は30μg dm(-3)(2×10(-6)mol dm(-3))であった. en-copyright= kn-copyright= en-aut-name=SanadaMasahiro en-aut-sei=Sanada en-aut-mei=Masahiro kn-aut-name=真田昌宏 kn-aut-sei=真田 kn-aut-mei=昌宏 aut-affil-num=1 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=2 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=FIA with gas-diffusion unit kn-keyword=FIA with gas-diffusion unit en-keyword=tubular microporous polytetrafluoroethylene kn-keyword=tubular microporous polytetrafluoroethylene en-keyword=determination of total carbonate and ammoniacal nitrogen kn-keyword=determination of total carbonate and ammoniacal nitrogen END start-ver=1.4 cd-journal=joma no-vol=42 cd-vols= no-issue=7 article-no= start-page=T105 end-page=T111 dt-received= dt-revised= dt-accepted= dt-pub-year=1993 dt-pub=19930705 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Determination of anionic surfactants in an aqueous medium by differential photometric titration method kn-title=微分光度滴定法による水溶液での陰イオン界面活性剤の定量 en-subtitle= kn-subtitle= en-abstract=A simple and rapid automatic photometric titration method was developed for the determination of anionic surfactants in a one-phase aqueous system with tetrabromophenolphthalein ethyl ester (TBPE) as an indicator. In the presence of non-ionic surfactants such as Triton X-100, protonated TBPE reacts with cation (Q(+)) to form an ion associate (Q(+)·TBPE(-)), causing a color change from yellow to blue. The titrant, distearyldimethylammonium ion, was added to an anionic surfactant solution at pH 3.2, and the absorbance changes were monitored by a fiber-optic sensor with a 630 nm interference filter. The end points were read from the inflection points with differential curves. Anionic surfactants at concentrations from 10(-6)10(-3) mol dm(-3) could be determined by the proposed method. The relative standard deviations of various anionic surfactants were 0.30.4%. The proposed method was applied to some practical samples, and the results, except for those of anionic surfactants possessing polyoxyethylenyl groups, were in good agreement with the results of the JIS titration method (Epton method) and a solvent extraction method with Ethyl Violet. kn-abstract=微分光度滴定装置を用いて,水溶液での陰イオン界面活性剤を定量する方法について検討した.滴定終点決定の指示薬系としては,酸性染料のテトラブロモフェノールフタレインエチルエステル(TBPE)と非イオン界面活性剤のTriton X-100(TX-100)の混合溶液を用いた.TBPEは非イオン界面活性剤の存在下で,酸性では黄色となり可溶化しているが,滴定剤の第四級アンモニウムイオンと反応するとイオン会合体を形成し,解離型(TBPE-)の青色(λ(max)=610nm)となる.滴定剤には第四級アンモニウム塩のジステアリルジメチルアンモニウム・クロリド(DSDMA(+)・Cl(-))を用いた.本滴定法で10(-6)～10(-3)Mの濃度範囲の陰イオン界面活性剤が定量できる.実際試料の定量結果はオキシエチレン基を持つもの以外の試料において,JIS滴定法(JIS K 3362)及びエチルバイオレット抽出吸光光度法(JIS K 0101)とよく一致した. en-copyright= kn-copyright= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=1 ORCID= en-aut-name=GaoYunhua en-aut-sei=Gao en-aut-mei=Yunhua kn-aut-name=高雲華 kn-aut-sei=高 kn-aut-mei=雲華 aut-affil-num=2 ORCID= en-aut-name=IshiharaShinsuke en-aut-sei=Ishihara en-aut-mei=Shinsuke kn-aut-name=石原進介 kn-aut-sei=石原 kn-aut-mei=進介 aut-affil-num=3 ORCID= en-aut-name=UemuraKouji en-aut-sei=Uemura en-aut-mei=Kouji kn-aut-name=上村幸次 kn-aut-sei=上村 kn-aut-mei=幸次 aut-affil-num=4 ORCID= en-aut-name=DaitoKazuyuki en-aut-sei=Daito en-aut-mei=Kazuyuki kn-aut-name=大藤和幸 kn-aut-sei=大藤 kn-aut-mei=和幸 aut-affil-num=5 ORCID= en-aut-name=WakisakaTatsushi en-aut-sei=Wakisaka en-aut-mei=Tatsushi kn-aut-name=脇阪達司 kn-aut-sei=脇阪 kn-aut-mei=達司 aut-affil-num=6 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=京都電子工業(株) affil-num=4 en-affil= kn-affil=京都電子工業(株) affil-num=5 en-affil= kn-affil=花王(株)素材研究所 affil-num=6 en-affil= kn-affil=花王(株)素材研究所 en-keyword=determination of anionic surfactants kn-keyword=determination of anionic surfactants en-keyword=photometric titration kn-keyword=photometric titration en-keyword=aqueous medium kn-keyword=aqueous medium en-keyword=distearyldimethylammonium ion kn-keyword=distearyldimethylammonium ion en-keyword=tetrabromophenolphthalein ethyl ester kn-keyword=tetrabromophenolphthalein ethyl ester END start-ver=1.4 cd-journal=joma no-vol=42 cd-vols= no-issue=3 article-no= start-page=151 end-page=157 dt-received= dt-revised= dt-accepted= dt-pub-year=1993 dt-pub=19930305 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Determination of phosphate and arsenate by a flotation-pairing ion exchange/extraction method kn-title=フローテーション/対イオン交換抽出法による極微量リン酸及びヒ酸の吸光光度定量 en-subtitle= kn-subtitle= en-abstract=Flotation-pairing ion exchange-extraction and spectrophotometric determination of trace amounts of phosphate and arsenate were examined. Ion association complexes of heteropoly acids and a bulky cationic dye floated on the interface between an aqueous and a less polor organic solvent phase. After the flotation, the heteropoly acids were exchanged for an anionic dye, which have a high molar absorptivity and the similar maximum absorption wavelength to the cationic dye. The sum of the absorbances of the cationic and the anionic dyes was measured. In this work, malachite green (MG(+)) and 4'-hydroxy-3,5,3',5',2",6"-hexachlorofuchsone (Cl(6)BZ), a hexachloro derivative of benzaurin, were used as a cationic and an anionic dye. The recommended procedure for phosphate determination is as follows. To a 50-cm(3) separatory funnel, take sample solution (up to 10 cm(3)); if arsenate coexists, add 0.1 cm3 of 2×10(-2) M Na(2)S(2)O(3) to reduce arsenate to arsenite. Then, add 1 cm(3) of 10 M hydrochloric acid, 1 cm(3) of 0.4 M (as Mo) molybdate, 0.5 cm(3) of 5×10(-4) M Malachite Green, and 2 cm(3) of flotation solvent (Isobutyl methyl ketone + cyclohexane= 1 +8 v/v). After shaking for 5 min, discard the aqueous phase, and wash the organic phase 2 times with 5 cm(3) of water. After 1 cm(3) of 2×10(-4) M anionic dye solution, 8 cm(3) of 1, 2-dichloroethane and 5 cm(3) of borax buffer (pH 9) are added, shake 10 times by hands. After the phase separation, measure the absorbance of the organic phase at 620 nm. As arsenate reacts under the same conditions as phosphate, arsenate can be determined by subtracting the amounts of phosphate from the total amounts of phosphate and arsenate which were obtained in the absence of Na(2)S(2)O(3). The apparent molar absorptivity of phosphate or arsenate was 5.7×10(5) dm(3) mol(-1) cm(-1), and the absorbance of the reagent blank was 0.005. Six times concentration was achieved when 30 cm(3) of aqueous phase and 5 cm(3) of extraction solvent were used. Bulky anionic ions, such as iodide, perchlorate and lauryl sulfate, did not interfere with the determination of phosphate and arsenate. This method was applied to the determination of phosphate in seawater and iron and steel samples. kn-abstract=フローテーション/対イオン交換抽出法を用いる極微量リン酸,及びヒ酸の吸光光度定量法を確立した.オルトリン酸とモリブデン酸との反応により生成したモリブドリン酸にマラカイトグリーン(MG(+))をイオン会合させ,この会合体を水相と有機相(シクロヘキサン+イソブチルメチルケトン=8+1v/v)の界面にフローテーションさせる.この後,MG(+)と近い極大吸収波長をもつ染料陰イオン(A(-)と略記)とモリブドリン酸を交換し,(MG(+)・A(-))イオン会合体を有機相(フローテーション溶媒+1,2-ジクロロエタン)に抽出する.ヒ酸も類似のイオン会合体を形成するため,同様にして定量することができる.A-としては新規合成酸性染料の4'-ヒドロキシ-3,5,3',5',2",6"-ヘキサクロロフクソン(以後,Cl(6)BZと略記)を用いた.リンを基準とした見掛けのモル吸光係数は620nmで5.7×10(5)dm(3)mol(-1)cm(-1)であった.この方法によるRSDは1×10(-6)Mのリン酸で0.29%(n=10)であった.本法は試薬から試験値が0.005と低く,6倍の濃縮も可能であり,これによりsub-ppb(10(-10)gml(-1))レベルのリンの定量が可能となった.又ヨウ化物イオン,過塩素酸イオン,ラウリル硫酸イオンなどのイオン会合抽出されやすい疎水性イオンの影響は,溶媒抽出法に比べはるかに小さいことが分かった.本法を海水,鉄鋼試料中のリン,ヒ素の定量に応用した. en-copyright= kn-copyright= en-aut-name=GotoNobutake en-aut-sei=Goto en-aut-mei=Nobutake kn-aut-name=後藤伸武 kn-aut-sei=後藤 kn-aut-mei=伸武 aut-affil-num=1 ORCID= en-aut-name=OshimaMitsuko en-aut-sei=Oshima en-aut-mei=Mitsuko kn-aut-name=大島光子 kn-aut-sei=大島 kn-aut-mei=光子 aut-affil-num=2 ORCID= en-aut-name=MotomizuShoji en-aut-sei=Motomizu en-aut-mei=Shoji kn-aut-name=本水昌二 kn-aut-sei=本水 kn-aut-mei=昌二 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=flotation-pairing ion-exchange-extraction kn-keyword=flotation-pairing ion-exchange-extraction en-keyword=heteropoly acid kn-keyword=heteropoly acid en-keyword=determination of phosphate and arsenate kn-keyword=determination of phosphate and arsenate en-keyword=Malachite Green and 4'-hydroxy-3,5,3',5',2 kn-keyword=Malachite Green and 4'-hydroxy-3,5,3',5',2 en-keyword=spectrophotometry kn-keyword=spectrophotometry END start-ver=1.4 cd-journal=joma no-vol=42 cd-vols= no-issue=12 article-no= start-page=873 end-page=880 dt-received= dt-revised= dt-accepted= dt-pub-year=1993 dt-pub=19931205 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Separation of metal ions and the determination of calcium and magnesium ions with N, N'-di(2-hydroxybenzyl)ethylenediamine-N, N'-diacetic acid by high-performance capillary electrophoresis kn-title=キャピラリー電気泳動によるN,N'-ジ(2-ヒドロキシベンジル)エチレンジアミン-N,N'-二酢酸を用いる金属イオンの分離とカルシウム及びマグネシウムイオンの定量 en-subtitle= kn-subtitle= en-abstract=The capillary electrophoresis study was carried out by using HBED as a chelating and coloring agent. The title compound HBED(H(4)Y) reacts with divalent (M(2+)) and trivalent metal ions (M(3+)) to form chelate anions MY(2-) and MY(-), respectively. Eleven divalent metal ions and three trivalent metal ions were detected as peaks at pH 9.3. When a carrier containing 2 × 10(-3) M HBED (pH 10.5) and sample solutions containing 1 × 10(-4) M HBED were used, the mobilities of the metal ions (absolute value) increased in the following order: Co(2+) (Co(3+)) (2.05) < Mn(2+) (2.10) < Al(3+) (2.12) < Fe(3+) (2.15) < Pb(2+) (2.64)