title: [Determination of 32 sulfonylurea herbicide residues in sweet corns and green soybeans by QuEChERS-liquid chromatography-tandem mass spectrometry].
abstract: A fast method based on QuEChERS methodology for the simultaneous determination of 32 sulfonylurea herbicide residues in sweet corns and green soybeans was developed using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The clean-up effects of three dispersive sorbents were evaluated in terms of the residue mass for extracts after evaporation and recoveries. The three sorbents were C18, a mixture of two sorbents--silica coated with zirconium dioxide (Z-Sep) and C18, a bonded C18 zirconia-coated silica (Z-Sep+). As a result, the best effects were obtained from using Z-Sep/C18 sorbents. The samples were extracted with acetonitrile, and salted out with anhydrous magnesium sulphate and sodium chloride. The extracts were cleaned up with dispersive solid phase extraction using Z-Sep/C18 sorbents. Chromatographic analysis was carried out using a CSH C18 column with gradient elution. The pesticides were analyzed by negative electrospray ionization tandem mass spectrometry under scheduled multiple reaction monitoring mode. The quantification was achieved using matrix-matched standard calibrations as the external standard. The recoveries at fortification levels of 10, 20, 100 µg/kg in sweet corns and green beans ranged from 80.0% to 108.2% with the relative standard deviations of 1.2%-13.0%. The limits of quantification (S/N ≥ 10) were 0.2-5.0 µg/kg. The method has been proven to be simple, sensitive, environmental, and thus suitable for the determination of the 32 sulfonylurea herbicide residues in sweet corns and green soy- beans.
authors.forename: Lianzhu
authors.initials: L
authors.lastname: Wang
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Huang
authors.forename: Dengfei
authors.initials: D
authors.lastname: Wang
authors.forename: Yong
authors.initials: Y
authors.lastname: Chen
authors.forename: Dunming
authors.initials: D
authors.lastname: Xu
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D002853:Chromatography, Liquid; D006540:Herbicides / Q000032:analysis*; D013025:Glycine max / Q000737:chemistry*; D013453:Sulfonylurea Compounds / Q000032:analysis*; D053719:Tandem Mass Spectrometry; D003313:Zea mays / Q000737:chemistry*
chemical_list: D006540:Herbicides; D013453:Sulfonylurea Compounds