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Photodegradation of bensulfuron‐methyl on soil surface

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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 SO2NH 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

Keywords: bensulfuron‐methyl; photolysis; rate kinetics; soil analysis

Document Type: Research Article

DOI: http://dx.doi.org/10.1002/ps.803

Affiliations: 1: Department of Plant Protection, Anhui Agricultural University, Hefei 230036, China 2: Institute of Soil Science, Chinese Academy of Sciences, PO Box 821, Nanjing 210008, China

Publication date: March 1, 2004

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