Abstract:To develop a new method for quantitative determination of 65herbicides belonging to different chemical families in vegetables by gas chromatography-mass spectrometry(GC-MS).MethodsSamples were ultrasonically extracted with acetonitrile and the extracts were cleanuped with Carb/NH2 cartridge before GC-MS analysis.Matrix-matched calibration was used for quantification.ResultsThe linearity was satisfying within the range of 10~1000μg/L,and the coefficients of determination(r)were above 0.998.The limits of detection(LODs)and the limits of quantification(LOQs)were 0.02~2.2μg/kg and 0.1~7.4μg/kg, respectively. The recoveries for spiked samples at the levels of 5,10and 20μg/kg ranged from 60.9% to 117.9%, except for EPTC and Etobenzanid in the range of 41.1%~59.4%.The relative standard deviations(RSD)were below 14.0%. Trifluralin was detected in 1out of 9vegetable samples collected from local market,with the concentration of 2.0μg/kg.Conclusion The proposed method was rapid,simple and sensitive for the analysis of 65herbicides in vegetables.