Abstract
Cloransulam-methyl, N-(2-carbomethoxy-6-chlorophenyl)-5-ethoxy-7-fluoro[1,2,4]triazolo[1,5-c]pyrimidine-2-sulfonamide, is a new broad-spectrum herbicide for use in soybeans. The U.S. Environmental Protection Agency requires that analytical methodology be developed to enforce tolerance levels of pesticides in food crops. This paper describes the method developed to enforce tolerance levels of cloransulam-methyl in soybeans and soybean forage, hay, and processed commodities. The method description includes validation data supporting a lower limit of quantitation of 0.01 μg/g (10 ppb) for cloransulam-methyl in each matrix. Extracts of each matrix are purified using C18 and neutral alumina solid phase extraction. Cloransulam-methyl is derivatized, using (trimethylsilyl)diazomethane, to the N-methylcloransulam-methyl. Quantitation and simultaneous confirmation of residues of cloransulam-methyl as N-methylcloransulam-methyl employ gas chromatography with mass spectrometric detection using electron impact ionization with selected ion monitoring. Keywords: Cloransulam-methyl; sulfonamide; soybeans; (trimethylsilyl)diazomethane; GC/MSD
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