ピラゾレートの除草活性本体DTPの水中および土壌表面上での光分解

  • 山岡 剛
    Agricultural Chemicals Research Laboratories, Sankyo Co., Ltd.
  • 辻野 泰宏
    Agricultural Chemicals Research Laboratories, Sankyo Co., Ltd.
  • 安藤 満
    Agricultural Chemicals Research Laboratories, Sankyo Co., Ltd.
  • 中川 昌之
    Agricultural Chemicals Research Laboratories, Sankyo Co., Ltd.
  • 石田 三雄
    Agricultural Chemicals Research Laboratories, Sankyo Co., Ltd.

書誌事項

タイトル別名
  • Photolysis of DTP, the Herbicidal Entity of Pyrazolate, in Water and on Soil Surface
  • ピラゾレートの除草活性本体DTPの水中および土壌表面上での光分解〔英文〕
  • ピラゾレート ノ ジョソウ カッセイ ホンタイ DTP ノ スイチュウ オヨビ

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抄録

Photolysis of DTP [4-(2, 4-dichlorobenzoyl)-1, 3-dimethyl-5-hydroxypyrazole], a hydrolysate and herbicidal entity of pyrazolate, was studied in water and on soil surface, using 14C-preparations labeled either at the 3rd position of the pyrazole ring or uniformly at the benzene ring. On exposure to sunlight, DTP in paddy water decomposed approximately twelve times faster, with the half-life of about 6 days, than in distilled water. Photolysis profile of DTP in paddy water was quite similar in both quality and quantity between two types of soil. On thin-layer plates of two types of soil, DTP gradually decomposed under sunlight. DTP underwent oxidation at the 1- and 3-methyl groups, cleavage of the benzoyl linkage, fission of the pyrazole and benzene rings, and was ultimately photomineralized. No volatilization of DTP from either water or soil was observed.

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