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Spectrophotometric determination of methomyl residues in selected vegetables, grains and soil.

Rangaswamy, J. R. and Prakash, S. R. and Vijayashankar, Y. N. (1977) Spectrophotometric determination of methomyl residues in selected vegetables, grains and soil. Journal of the Association of Official Analytical Chemists, 60 (5). 1093-1096, 5 ref..

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Abstract

Methomyl (S-methyl-N-[(methylcarbamoyl)oxy]thioacetimidate) is converted to oxime and hydroxylamine by alkali and acid treatment, resp. Hydroxylamine is oxidized with iodine in the presence of sulphanilic acid to yield p-diazoniumbenzenesulphonic acid which is coupled with alpha-naphthylamine to form a crimson p-benzenesulphonic acid-azo-alpha-naphthylamine with an absorption max. at 520 nm. The relationship between absorbance and concn. of methomyl is linear in the range 0.5-10 mug. The method is sensitive and specific; 0.625 p.p.m. methomyl can be determined in 40 g samples of selected vegetables, grains and soil (including cowpea, tomato, okra, wheat, sorghum and paddy).

Item Type: Article
Uncontrolled Keywords: GRAIN-; methomyl residues detn. in grain; INSECTICIDES-; grain, methomyl residues detn. in; vegetables, methomyl residues detn. in; VEGETABLES-; methomyl residues detn. in vegetables; SPECTROSCOPY-
Subjects: 500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 26 Pesticide Chemistry
600 Technology > 08 Food technology > 01 Analysis
600 Technology > 08 Food technology > 16 Nutritive value > 08 Grains
Divisions: Food Protectants and Infestation Control
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 29 Dec 2016 08:50
Last Modified: 29 Dec 2016 08:50
URI: http://ir.cftri.com/id/eprint/7038

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