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ID 19974
Eprint ID
19974
FullText URL
Author
Motomizu, Shoji
Oshima, Mitsuko
Yoneda, Naomi
Iwashido, Tadashi
Abstract
Calcium in water was determined by a spectrophotometric method involving flow injection coupled with solvent extraction. An ion association complex which formed between a calcium-crown complex ion and a dye anion was extracted into an organic solvent and the absorbance of the organic phase was measured after phase separation. Six derivatives of alkylaminophenylazobenzene sulfonic acid and tetrabromophenolphthalein ethylester were examined as counter anions with dicyclohexano-24-crown-8, and a mixture of benzene and chlorobenzene was examined as an extraction solvent. A suitable method for calcium determination in water was one with Propyl Orange and a (1+1 v/v) mixture of benzene and chlorobenzene. The carrier stream was distilled water, while the reagent stream was comprised of a dye anion and lithium hydroxide. The sampling rate was 20-30 per hour. The calibration graph was linear at concentrations up to 10(-4)M using samples of 100μl. The detection limit corresponding to a signal-to-noise ratio of 3 was 2×10(-7)M; the relative standard deviation was 0.99% for 10 injections of 5×10(-5)M calcium solution. Calcium in river water was determined satisfactorily by the proposed method.
Keywords
Calcium, Propyl Orange
dicyclohexano-24-crown-8
spectrophotometry
solvent extraction
flow-injection method
Published Date
1990-04-10
Publication Title
Analytical Sciences
Volume
volume6
Issue
issue2
Publisher
日本分析化学会
Publisher Alternative
Japan Society for Analytical Chemistry
Start Page
215
End Page
220
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