Leaching and degradation of ethametsulfuron-methyl in soil

Chemosphere. 2005 Jul;60(5):601-9. doi: 10.1016/j.chemosphere.2005.01.051.

Abstract

Leaching and degradation of the herbicide ethametsulfuron-methyl[methyl 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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Benzoates / chemistry*
  • Benzoates / metabolism*
  • Half-Life
  • Hydrogen-Ion Concentration
  • Soil
  • Soil Pollutants / metabolism*
  • Temperature
  • Time Factors
  • Triazines / chemistry*
  • Triazines / metabolism*

Substances

  • Benzoates
  • Soil
  • Soil Pollutants
  • Triazines
  • methyl 2-(((((4-ethoxy-6-(methylamino)-1,3,5-triazin-2-yl)amino)carbonyl)amino)sulfonyl)benzoate