Screening Method for Nine Sulfonylurea Herbicides in Soil and Water by Liquid Chromatography with Ultraviolet Detection.
An analytical method is described for the preliminary analysis of azimsulfuron, chlorimuron-ethyl, chlorsulfuron, ethametsulfuron-methyl, flupyrsulfuron-methyl, metsulfuron-methyl, sulfometuron-methyl, thifensulfuron-methyl, and tribenuron-methyl in soil (LOQ = 1 ppb) and in water (LOQ = 0.1 ppb). HPLC chromatograms show little to no response for control samples when compared to the lowest fortifications. Average recoveries at the limit of quantitation and above are in the 70-120% range, with relative standard deviations of <20%. Extraction efficiency experiments demonstrated the ability of this method to extract sulfonylureas from soil samples. This method is suitable for screening of samples; however, LC/MS would be required for a definitive confirmation.
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E. I. du Pont de Nemours and Company, DuPont Agricultural Products, Experimental Station, Wilmington, Delaware 19880-0402.
de Bernard PA