Spectrophotometric determination of methomyl residues in selected vegetables, grains and soil.
IR@CFTRI: CSIR-Central Food Technological Research Institute, Mysore
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http://ir.cftri.com/7038/
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| Title |
Spectrophotometric determination of methomyl residues in selected vegetables, grains and soil.
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| Creator |
Rangaswamy, J. R.
Prakash, S. R. Vijayashankar, Y. N. |
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| Subject |
26 Pesticide Chemistry
01 Analysis 08 Grains |
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| Description |
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).
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| Date |
1977
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Language |
en
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| Rights |
—
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| Identifier |
http://ir.cftri.com/7038/1/Journal%20of%20the%20Association%20of%20Official%20Analytical%20Chemists%2C%20Volume-60%285%20%281977%29%201093-1096.pdf
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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