ID | 19982 |
Eprint ID | 19982
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FullText URL | |
Author |
Motomizu, Shoji
Hazaki, Yoshito
Oshima, Mitsuko
Toei, Kyoji
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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.
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Keywords | Anionic surfactant determination
cationic azo dye
ion associate extraction
spectrophotometry
flow injection analysis
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Published Date | 1987-06-10
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Publication Title |
Analytical Sciences
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Volume | volume3
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Issue | issue3
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Publisher | 日本分析化学会
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Publisher Alternative | Japan Society for Analytical Chemistry
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Start Page | 265
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End Page | 269
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ISSN | 0910-6340
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NCID | AA10500785
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Content Type |
Journal Article
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language |
English
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Copyright Holders | 日本分析化学会
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File Version | publisher
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Refereed |
True
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DOI |