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ID 19969
Eprint ID
19969
FullText URL
Author
Motomizu, Shoji
Susanto, Joko P.
Oshima, Mitsuko
Mikasa, Hiroshi
Hori, Yoshikazu
Abstract
A sensitive spectrophotometric method for the determination of ultra-trace amounts of phosphate ion is proposed. The colored ion associate formed between molybdophosphate and Malachite Green (MG) was filtered through a tiny membrane filter (cellulose nitrate; poresize, 1.0μm; 9mm diameter), dissolved together with the membrane filter in 1cm(3) or less of Methyl Cellosolve; the absorbance of the solution was then measured at 627nm with a flow-through system equipped with an autosampler. The absorbance, the standard deviation and the relative standard deviation of the reagent blank were 0.0270, 0.0005 and 1.8%, respectively. A calibration graph was linear over the range from 0.018 to 1.0ng cm(-3) (1ppb) of phosphorus using 40cm(3) of sample solutions; the detection limit corresponding to two-times the standard deviation of the reagent blank was 3ppt of phosphorus. By using the proposed method, phosphate ion in pure water samples were determined.
Keywords
Phosphate determination
filtration-dissolution
molybdophosphate-Malachite Green ion associate
Published Date
1995-02-10
Publication Title
Analytical Sciences
Volume
volume11
Issue
issue1
Publisher
日本分析化学会
Publisher Alternative
Japan Society for Analytical Chemistry
Start Page
155
End Page
160
ISSN
0910-6340
NCID
AA10500785
Content Type
Journal Article
language
英語
Copyright Holders
日本分析化学会
File Version
publisher
Refereed
True
DOI