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Spectrophotometric Determination of Sevin in Natural Waters
Author(s) -
Aly Osman M.
Publication year - 1967
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1967.tb03426.x
Subject(s) - oxidizing agent , chloroform , chemistry , phosphate buffered saline , 1 naphthol , hydrolysis , chromatography , extraction (chemistry) , aqueous solution , ammonia , organic chemistry
This article discusses a spectrophotometric method that was developed for the determination of sevin (l‐naphthyl‐N‐methylcarbamate) as well as its hydrolysis product, l‐naphthol, in natural waters. The quantitative determination involves the extraction with chloroform and the hydrolysis of sevin to I‐naphthol. The latter reacts with 4‐aminoantipyrine and an oxidizing agent in alkaline medium to form a red‐colored complex. Ammonia‐phosphate buffer was used to stabilize the pH at 8.2 ± 0.3. Free I‐naphthol, if present, is removed from the chloroform extract into a basic aqueous solution and can be determined separately. The sensitivity is about 5 µg/l for sevin and 8 µg/l for l‐naphthol. Recoveries were 98.5 per cent for sevin and 99 per cent for I‐naphthol.