Determination of Multi-residues of Thirteen Sulfonylurea Herbicides in Soil by Ultra Performance Liquid Chromatography-Electrospray Ionization Tandem Mass Spectrometry

A UPLC-MS/MS method was established for the simultaneous determination of thirteen sulfonylurea herbicides multiresidues in soil.Samples were extracted from soil with phosphate buffer(pH 7.8)-methanol(1∶1,by volume) in oscillator and purified by Oasis HLB solid phase extraction cartridge.The extracts were determined under multiple reaction monitoring mode.The quantification was performed by the external standard method.The results indicated that the linear ranges of thirteen sulfonylureas were in the range of 5-200 μg/L,with correlation coefficients of 0.999 1-0.999 9.The average recoveries of thirteen sulfonylurea herbicides from the soil sample at two spiked levels of 5 and 20 μg/kg ranged from 89% to 103% with relative standard deviations of 1.1%-11.2%.The limits of detection(LOD) were in the range of 0.020-0.092 μg/kg,and the limits of quantitation(LOQ) were 0.07-0.31 μg/kg.