Application of coupled liquid chromatography–mass spectrometry in hydrolysis studies of the herbicide ethametsulfuron-methyl

Influence of organic amendment on the adsorption and leaching of ethametsulfuron-methyl in acidic soils in China

“…The DT 50 of ethametsulfuron-methyl at 25 8C in a loam soil (pH 5.0, 1.8% organic matter) under laboratory aerobic conditions was approximately 18 days (Si et al, in press). The degradation pathways included the cleavage of the sulfonylurea bridge, N-and Odealkylation, and triazine ring opening (Si et al, 2005).…”

Urea Pesticides

“…But, unfortunately, lower persistence in the environment does not necessarily correspond to lower toxicity, since many herbicides undergo natural degradation reactions in the environment that do not lead to mineralization but to the formation of new species potentially more toxic and stable than the precursors (Bottaro et al, 2008). The most important pathways of degradation of SU in soil are chemical hydrolysis and microbial degradation, while other dissipation processes such as volatilization and photolysis are relatively insignificant (Saha & Kulshrestha, 2008;Si et al, 2005;Wang Y. S. et al, 2010). SU typical field dissipation half-lives (t 1/2 ) are about 1-8 weeks in some cases, but within a few days in the case of some newer compounds.…”