Leaching and degradation of ethametsulfuron-methyl in soil |
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Authors: | Si Youbin Wang Shenqiang Zhou Jing Hua Rimao Zhou Dongmei |
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Institution: | College of Resource and Environmental Science, Anhui Agricultural University, Hefei 230036, China. ybsi2002@yaho.com.cn |
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Abstract: | Leaching and degradation of the herbicide ethametsulfuron-methylmethyl 2-(4-ethoxy-6-methylamino-1,3,5-triazine-2-yl)carbamoylsulfamoyl]benzoate] in three soils were investigated under laboratory conditions. Ethametsulfuron-methyl was mobile on soils when tested using non-aged and aged soil columns; this mobility agreed reasonably well with Freundlich soil isotherm constants. It was found that ethametsulfuron-methyl was more mobile in alkaline sandy Vertisol soil and neutral loamy Alfisol soil than in acidic clayey Red soil. Degradation of ethametsulfuron-methyl in soils was pH-dependent; calculated half-life (t(1/2)) values ranged from 13 to 67 days. Ethametsulfuron-methyl was more persistent in neutral or weakly basic than in acidic soil. Five soil metabolites were isolated and identified by LC/MS/MS analysis. The degradation pathways included the cleavage of the sulfonylurea bridge, N- and O-dealkylation, and triazine ring opening. |
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