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Transformation of fenuron induced by photochemical excitation of humic acids

✍ Scribed by Aguer, Jean-Pierre; Richard, Claire

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 299 KB
Volume: 46
Category: Article
ISSN: 1526-498X
DOI: 10.1002/(sici)1096-9063(199602)46:2<151::aid-ps328>3.0.co;2-#

No coin nor oath required. For personal study only.

✦ Synopsis

When neutral solutions containing the herbicide 3-phenyl-1,ldimethylurea (fenuron) and a humic acid are irradiated at 365 nm, 3-(4-hydroxy-pheny1)-1,l-dimethylurea and three biphenyl products are formed as main products. The apparent quantum yield of fenuron disappearance is evaluated as 6.2 x 10-5mole E-'.

Upon irradiation of the same mixture at 253.7 nm, both direct and induced phototransformations of fenuron occur. Direct photooxidation yields 2-and 4- amino-N,N-dimethylbenzamide. The induced phototransformation leads to 2and 4-hydroxylation of the aromatic ring in accordance with the fact that hydroxyl radicals are involved in the oxidation.

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