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Sunlight degradation of diafenthiuron in various aqueous solutions and pure hexane yielded two major identified products: 1\u2010<jats:italic>tert<\/jats:italic>\u2010butyl\u20103\u2010(2,6\u2010di\u2010isopropyl\u20104\u2010phenoxyphenyl)carbodiimide (CGA\u2010140\u2005408) and 1\u2010<jats:italic>tert<\/jats:italic>\u2010butyl\u20103\u2010(2,6\u2010di\u2010isopropyl\u20104\u2010phenoxy\u2010phenyl)urea (CGA\u2010177\u2005960). CGA\u2010140\u2005408 was further photo\u2010transformed into CGA\u2010177\u2005960 by sunlight. Direct photolysis appeared to be a major photolysis pathway of diafenthiuron in the environment. Photodegradation of CGA\u2010140\u2005408 and CGA\u2010177\u2005960 was enhanced in humic acid water, paddy water and aqueous acetone solutions, and followed first\u2010order kinetics. Isopropanol (a radical quencher) and de\u2010aeration strongly inhibited the photolysis of these chemicals, which suggested oxygen radical\u2010mediated reactions.<\/jats:p><jats:p>\u00a9 2002 Society of Chemical Industry<\/jats:p>","DOI":"10.1002\/ps.483","type":"journal-article","created":{"date-parts":[[2002,8,25]],"date-time":"2002-08-25T19:44:07Z","timestamp":1030304647000},"page":"496-502","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Photodegradation of diafenthiuron in 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