Degradation and Leaching Behavior of the Carbamate Fungicide Diethofencarb in Soils

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  • SAKATA Shinoi
    Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd.
  • KATAGI Toshiyuki
    Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd.
  • YOSHIMURA Jun
    Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd.
  • MIKAMI Nobuyoshi
    Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd.
  • YAMADA Hirohiko
    Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd.

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Other Title
  • 殺菌剤ジエトフェンカルブの土壌中での分解と溶脱
  • 殺菌剤ジエトフェンカルブの土壌中での分解と溶脱〔英文〕
  • サッキンザイ ジエトフェンカルブ ノ ドジョウチュウ デ ノ ブンカイ ト ヨ

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Abstract

Degradation of diethofencarb [Isopropyl 3, 4-diethoxycarbanilate] was studied in two soils under laboratory conditions with 14C preparations labeled separately at the phenyl ring and the C-2 position of the isopropyl group. Its half-life of disappearance was 0.3 to 6.2 days in aerobic upland soils. The major metabolite was a nitrated derivative at the 6-position of the phenyl ring of diethofencarb, which amounted to 2.4-4.7% of the applied 14C throughout the incubation period. Both of the 14C-labeled diethofencarbs were mineralized to 14CO2 in soils amounting to 30.5-57.0% of the applied 14C after a 270-day incubation. Diethofencarb slowly degraded under anaerobic upland conditions and hardly degraded in sterilized soils. Diethofencarb was present in an effluent from sand containing organic matter by less than 0.1%, but it and its nitrated derivative did not leach into water from soils containing organic matter by more than 3%.

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