Photodegradation of the Fungicide Toiclofos-methyl in Water and on Soil Surface
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- MIKAMI Nobuyoshi
- Laboratory of Biochemistry and Toxicology, Takarazuka Research Center, Sumitomo Chemical Co., Ltd.
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- IMANISHI Kumiko
- Laboratory of Biochemistry and Toxicology, Takarazuka Research Center, Sumitomo Chemical Co., Ltd.
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- YAMADA Hirohiko
- Laboratory of Biochemistry and Toxicology, Takarazuka Research Center, Sumitomo Chemical Co., Ltd.
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- MIYAMOTO Junshi
- Laboratory of Biochemistry and Toxicology, Takarazuka Research Center, Sumitomo Chemical Co., Ltd.
Bibliographic Information
- Other Title
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- 殺菌剤 tolclofos-methyl の水中および土壌表面上における光分解
- 殺菌剤tolclofos-methylの水中および土壌表面上における光分解〔英文〕
- サッキンザイ tolclofos methyl ノ スイチュウ オヨビ ドジョ
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Abstract
Photodegradation of the organophosphorous fungicide tolclofos-methyl [Rizolex®, O, O-dimethyl O-(2, 6-dichloro-4-methylphenyl)phosphorothioate] radiolabeled at the phenyl ring has been studied. On exposure to natural sunlight, the fungicide was photodegraded with half-lives of 44 days in distilled water, 15-28 days in natural river and pond water, and less than 2 days in 2% aqueous acetone. The quantum yield was determined to be 1.6×10-1 (at 313nm in water), and the half-life of disappearance at 40 degree North Latitude was calculated to be 40±5 days in spring. Toiclofos-methyl applied on soil thin layer plates was promptly dissipated from four kinds of soil through photodegradation and volatilization, with a half-life of less than 2 days. The fungicide underwent photoisomerization, oxidation at the 4-methyl group or oxidation from the P=S to the P=O group, and cleavage of the P-O-aryl or P-O-methyl linkage in water and on soil surface. Photomineralization of the radiocarbon was also observed in 2% aqueous acetone. Evaporation was found to be also a significant factor for dissipation of tolclofos-methyl from a water body.
Journal
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- Journal of Pesticide Science
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Journal of Pesticide Science 9 (2), 215-222, 1984
Pesticide Science Society of Japan
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Details 詳細情報について
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- CRID
- 1390282680187019904
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- NII Article ID
- 110001711861
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- NII Book ID
- AN00196227
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- ISSN
- 03851559
- 13490923
- 1348589X
- http://id.crossref.org/issn/1348589X
- http://id.crossref.org/issn/0031613X
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- NDL BIB ID
- 2987381
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- NDL-Digital
- CiNii Articles
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- Abstract License Flag
- Disallowed