収穫後処理したフェニトロチオンの貯穀中における挙動

DOI NDLデジタルコレクション 日本農学文献記事索引 Web Site 被引用文献1件
  • 滝本 善之
    Research Department, Pesticides Division, Sumitomo Chemical Co., Ltd.
  • 大嶋 昌子
    Research Department, Pesticides Division, Sumitomo Chemical Co., Ltd.
  • 宮本 純之
    Research Department, Pesticides Division, Sumitomo Chemical Co., Ltd.

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タイトル別名
  • Degradation and Fate of Fenitrothion Applied to Harvested Rice Grains

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Rice grains with 14% moisture content were treated with carbon-14 fenitrothion, Sumithion® or O, O-dimethyl O-(3-methyl-4-nitrophenyl) phosphorothioate labeled at m-methyl group of phenyl moiety, at the concentration of 6 and 15ppm, and stored at 15°C or 30°C for 12 months. Decomposition of fenitrothion proceeded more rapidly at 30°C than at 15°C, with the respective half-life of about 4 months and more than 12 months, independently of the applied concentrations. Desmethyl-fenitrothion was produced at early stage of incubation (until 4.5 months), amounting to about 20% and 10% of the applied radioactivity at 30°C and 15°C, respectively, whereas 3-methyl-4-nitrophenol was formed with the lapse of time and accounted for 38% and 17% at 30°C and 15°C after 12 months, respectively. Other than the above two major decomposition products, fenitrothion S-isomer, fenitrooxon, desmethylfenitrothion S-isomer, desmethylfenithrooxon 3-hydroxymethyl-4-nitrophenol, 1-methoxy-3-methyl-4-nitrobenzene, 1, 2-dihydroxy-4-methyl-5-nitrobenzene and 1, 2-dimethoxy-4-methyl-5-nitrobenzene were also formed in small amounts. Fenitrothion and its decomposition products penetrated into grains about 100μ in depth from the surface, to the outer portions of endosperm, after 12 month incubation. Approximately 60% of the applied radioactivity was removed by milling, leaving 4ppm of fenitrothion at the maximum in polished rice grains. By cooking unpolished rice grains treated with fenitrothion, fenitrothion was decomposed mainly to desmethylated derivatives and 3-methyl-4-nitrophenol. These findings were discussed in comparison with those of radioactive malathion, indicating that malathion was decomposed at a similar rate to that of fenitrothion to majorly desmethylmalation and malathion -monoacids and -diacid.

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