フェンバレレート (スミサイジン<sup>®</sup>) の土壌および土壌微生物による代謝・分解

  • 大川 秀郎
    Research Department, Pesticides Division, Sumitomo Chemical Co., Ltd.
  • 南部 健二
    Research Department, Pesticides Division, Sumitomo Chemical Co., Ltd.
  • 乾 博
    Research Department, Pesticides Division, Sumitomo Chemical Co., Ltd.
  • 宮本 純之
    Research Department, Pesticides Division, Sumitomo Chemical Co., Ltd.

書誌事項

タイトル別名
  • Metabolic Fate of Fenvalerate (Sumicidin<sup>®</sup>) in Soil and by Soil Microorganisms

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When fenvalerate [α-cyano-3-phenoxybenzyl-2-(4-chlorophenyl)isovalerate] labeled with 14C at the CN group or at the CO group was applied to soils at the rate of 1.0ppm and held at 25±2°C in the dark under aerobic upland conditions, this chemical was gradually degraded with time. The half-life of fenvalerate was 15 days and 3 months, and the residue level after 8 months was 0.043ppm and 0.151ppm in Kodaira and Azuchi soils, respectively. Fenvalerate was more slowly degraded under anaerobic upland conditions and hardly degraded in sterilized soils. Fenvalerate underwent degradation in soils via several pathways, including ester cleavage, biphenyl ether cleavage, ring hydroxylation and hydration of the CN group to the CONH2 group. The degradation products resulted from these reactions were not persistent in soils and further degraded to yield 14CO2. In addition, fenvalerate was actively degraded in culture solutions of soil bacteria and fungi. The metabolites produced were nearly the same as those of aerobic upland soils.<br>Fenvalerate was hardly eluted with water from Kodaira, Azuchi and Katano soils, whereas it moved to a small extent in Muko sandy soil. One of the degradation products, 2-(4-chlorophenyl)isovaleric acid, was eluted from the soils tested.

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