Citation: WANG Lianzhu, HUANG Xiaoyan, WANG Dengfei, CHEN Yong, XU Dunming, ZHOU Yu. Determination of 32 sulfonylurea herbicide residues in sweet corns and green soybeans by QuEChERS-liquid chromatography-tandem mass spectrometry[J]. Chinese Journal of Chromatography, ;2015, 33(5): 501-507. doi: 10.3724/SP.J.1123.2014.12043 shu

Determination of 32 sulfonylurea herbicide residues in sweet corns and green soybeans by QuEChERS-liquid chromatography-tandem mass spectrometry

1.
1. Zhangzhou Entry-Exit Inspection and Quarantine Bureau, Zhangzhou 363100, China;

Corresponding author: WANG Lianzhu,
Received Date: 30 December 2014

Fund Project: 福建省自然科学基金项目(2011J01386). (2011J01386)

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 soybeans.
- QuEChERS,
- zirconium dioxide,
- liquid chromatography-tandem mass spectrometry (LC-MS/MS),
- sulfonylurea herbicide,
- sweet corn,
- green soybean
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沈阳化工大学材料科学与工程学院沈阳 110142