Metabolic Fate of the Acaricide Fenothiocarb in Soils

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  • 殺ダニ剤 fenothiocarb の土壌中における代謝運命
  • 殺ダニ剤fenothiocarbの土壌中における代謝運命〔英文〕
  • サツダニザイ fenothiocarb ノ ドジョウチュウ ニ オケル タイシ

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Abstract

The degradation of [phenoxy-U-14C] fenothiocarb (FC) in Okitsu alluvial and Ibaraki volcanic ash soils was studied under upland and flooded conditions. Fenothiocarb was more rapidly degraded under upland conditions than under flooded conditions. In Okitsu soil under upland conditions, the degradation of 14C-fenothiocarb was slightly enhanced when the soil was pre-treated with non-radioactive fenothiocarb, while it was retarded when the soil was sterilized. 14CO2 was gradually liberated in two soils under upland conditions, where the half-lives of fenothiocarb were 8 and 15 days for Okitsu and Ibaraki soils, respectively. The soil bound 14C-residues were found in the humic acid, fulvic acid and fumin fractions. Nine degradation products were observed in both soils under upland and flooded conditions, which were identified as fenothiocarb sulfoxide, 4′-hydroxy-fenothiocarb, N-formyl-fenothiocarb, monodesmethyl-fenothiocarb, didesmethyl-fenothiocarb, methyl 4-phenoxybutyl sulfoxide, methyl 4-phenoxybutyl sulfone, phenoxyacetic acid and 4-phenoxybutylsulfonic acid.

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