• 三上 信可
    Laboratory of Biochemistry and Toxicology, Takarazuka Research Center, Sumitomo Chemical Co., Ltd.
  • 坂田 信以
    Laboratory of Biochemistry and Toxicology, Takarazuka Research Center, Sumitomo Chemical Co., Ltd.
  • 山田 宏彦
    Laboratory of Biochemistry and Toxicology, Takarazuka Research Center, Sumitomo Chemical Co., Ltd.
  • 宮本 純之
    Laboratory of Biochemistry and Toxicology, Takarazuka Research Center, Sumitomo Chemical Co., Ltd.

書誌事項

タイトル別名
  • Further Studies on Degradation of Fenitrothion in Soils
  • フェニトロチオンの土壌中における分解〔英文〕
  • フェニトロチオン ノ ドジョウチュウ ニ オケル ブンカイ エイブン

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抄録

The degradation of fenitrothion (I) and 3-methyl-4-nitrophenol (II), one of the major degradation products in soil, was studied, using 14C preparations labeled at the phenyl ring. In two kinds of aerobic upland soils, I and II degraded with an initial half-life of less than 7 days. A main degradation route of I was a cleavage of the P-O-aryl linkage, leading to the formation of II which underwent further metabolism to 14CO2. In soils treated initially with II, a trace amount of 3-methyl-4-nitrocatechol was detected. When soils containing the bound 14C residues arising from I were mixed with fresh soil, 17.5 to 22.4% of the bound 14C was mineralized to 14CO2 over 22-week period. In two kinds of submerged soils, I degraded mainly via reduction of the nitro group to the amino group with an initial half-life of less than 7 days. The resultant product was bound to the soils or metabolized further to the formylamino and acetylamino derivatives. In addition, a relatively large amount of 14CO2 was evolved from the soils. When the conditions of the submerged soils were altered to those of aerobic upland by draining the flooded water, the bound 14C residues were partially mineralized to 14CO2. Furthermore, the bound 14C residues in upland and submerged soils were hardly taken up by bean and rice plants, respectively.

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