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Photodegradation of bensulfuron‐methyl on soil surface
Author(s) -
Si YouBin,
Yue YongDe,
Chen HuaiMan,
Zhou DongMei
Publication year - 2004
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.803
Subject(s) - photodegradation , chemistry , vertisol , environmental chemistry , soil water , organic matter , environmental science , soil science , catalysis , organic chemistry , photocatalysis
Abstract Photolysis of bensulfuron‐methyl on soil surface was studied under sunlight and UV light. Seven photoproducts were isolated and characterised by spectroscopic methods. The major processes in the photolysis of bensulfuron‐methyl in soil are cleavage of the sulfonylurea bridge, scission of the SO 2 NH bond and contraction of the sulfuronylurea bridge. The rates of photodegradation of bensulfuron‐methyl on different soils followed first‐order rate kinetics with half lives of 21.9, 28.4, 36.9, 59.2 and 47.2 h (UV) and 23.1, 27.5, 29.1, 38.9 and 33.8 days (sunlight) for vertisol, alluvial, alfisol, red and laterite soils, respectively. The differences in rates of photodegradation were dependent upon the soil texture and organic matter content. Copyright © 2004 Society of Chemical Industry