殺虫剤S-メチル-N-[(メチルカーバモイル)オキシ]チオアセトイミデート(メソミル)の定量 : 農薬および関連化合物の分析に関する研究(第18報)

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A quantitative method for the determination of S-methyl-N-[(methylcarbamoyl) oxy] thioacetoamidate (methomyl) by thin layer chromatographic separation and bromometric titration has been developed. Methomyl was suggested to be quantitatively oxidized with bromine in an acetic acid solution to give the corresponding sulfoxide. One ml of chloroform solution containing about 12 mg of methomyl was applied to a silica gel plate and developed with diethylether-acetone (19 : 1). The portion of silica gel corresponding to the Rf-values of methomyl (about 0.4) was scraped from the plate and transferred to a 500 ml iodine flask. Thirty ml of glacial acetic acid and 30 ml of 0.02 N bromine solution were added and the mixture was allowed to stand for an hour at room temperature in the dark. As soon as 20 ml of 2N sulfuric acid, 50 ml of water and 10 ml of 20% potassium iodide aqueous solution were added in these order, the excess bromine replaced by iodine was titrated with 0.02N sodium thiosulfate solution.
社団法人日本分析化学会の論文