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Photochemistry of vinclozolin in water and methanol-water solution

โœ Scribed by Schick, Bernhard; Moza, Pran N; Hustert, Klaus; Kettrup, Antonius

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
114 KB
Volume
55
Category
Article
ISSN
1526-498X

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โœฆ Synopsis

The photolysis of the fungicide vinclozolin in aqueous and methanolยฑwater (50 50 by volume) solution has been examined. Irradiation at l = 254 nm for 10 minutes resulted in `90% and 95% substrate transformation respectively. The dissipation of vinclozolin both in water and methanol water was linear and the calculated half-lives were 1.01 and 2.0 min respectively. Irradiation (8 h) with UV light (l ! 290 nm) resulted in 10% degradation of the chemical, which is of the same magnitude as that of the control (not irradiated). Irradiation (8 h) under artiยฎcial sunlight (Suntest) in the presence of commercially available humic acid (K-salt) resulted in 55% degradation of the chemical. Photolysis leads to the opening of the 2,4-oxazolidine-dione ring, forming 3,5dichlorophenyl isocyanate and 3,5-dichloroaniline. In addition, dechlorination and elimination of the รCH=CH 2 moiety takes place, and one or both the chlorine atoms are replaced by a methoxy group.

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