微分スペクトル法によるチオファネートメチルの残留分析

概要

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Application of derivative spectrophotometry to residue analysis of thiophanate-methyl [dimethyl 4, 4′-o-phenylene-bis(3-thioallophanate)] (TM) was investigated. The results showed that derivative spectrophotometry was more suitable than ultraviolet spectrophotometry and high performance liquid chromatography which were already published. TM and its degraded product, 2-methyl benzeimidazoyle carbamate (MBC), were extracted together with methanol from crop and soil and transferred into methylene chloride. After evaporating the solvent, TM was converted to MBC by refluxing with copper acetate in 50% aqueous acetic acid. After liquid-liquid separation, 4th derivative spectrum of MBC in 1 N hydrochloric acid was recorded by a Hitachi spectrophotometer type 330. The amount of MBC was proportional to the difference absorbance (⊿A=A_<281>-A_<285>) within the range of 0-0.5ppm. The detection limit of TM was 0.008ppm when 100g of sample was used. Recoveries of TM were 80% in crop and 87% in soil, respectively.
日本農薬学会の論文
1982-11-20