Photodegradation of diafenthiuron in water

Diafenthiuron, 1-tert-butyl-3-(2,6-di-isopropyl-4-phenoxyphenyl)thiourea, is an effective insecticide and acaricide. Sunlight degradation of diafenthiuron in various aqueous solutions and pure hexane yielded two major identified products: 1-tert-butyl-3-(2,6-di-isopropyl-4-phenoxyphenyl)carbodiimide...

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Veröffentlicht in:Pest management science 2002-05, Vol.58 (5), p.496-502
Hauptverfasser: Keum, Young-Soo, Kim, Jeong-Han, Kim, Yong-Whan, Kim, Kyun, Li, Qing X
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Sprache:eng
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Zusammenfassung:Diafenthiuron, 1-tert-butyl-3-(2,6-di-isopropyl-4-phenoxyphenyl)thiourea, is an effective insecticide and acaricide. Sunlight degradation of diafenthiuron in various aqueous solutions and pure hexane yielded two major identified products: 1-tert-butyl-3-(2,6-di-isopropyl-4-phenoxyphenyl)carbodiimide (CGA-140 408) and 1-tert-butyl-3-(2,6-di-isopropyl-4-phenoxy-phenyl)urea (CGA-177 960). CGA-140 408 was further photo-transformed into CGA-177 960 by sunlight. Direct photolysis appeared to be a major photolysis pathway of diafenthiuron in the environment. Photodegradation of CGA-140 408 and CGA-177 960 was enhanced in humic acid water, paddy water and aqueous acetone solutions, and followed first-order kinetics. Isopropanol (a radical quencher) and de-aeration strongly inhibited the photolysis of these chemicals, which suggested oxygen radical-mediated reactions.
ISSN:1526-498X
1526-4998
DOI:10.1002/ps.483