Abstract:A rapid method for the simultaneous determination of flucarbazone-sodium and flucetosulfuron in tea was developed by ultra performance liquid chromatography tandem mass spectrometry（UPLC-MS/MS）coupled with QuEChERS.Flucarbazone-sodium and flucetosulfuron residues in tea were extracted with acetonitrile，and cleaned up by graphitized carbon black powder as dispersive solid-phase extraction sorbent.After centrifugation and filtration，the target compounds were analyzed by ultra performance liquid chromatography tandem mass spectrometry（UPLC-MS/MS）and quantified by the external standard method.Effects of different extraction solvents and sorbents，amount of graphitized carbon black powder on the determination of flucarbazone-sodium and flucetosulfuron were investigated.The results showed good linearities for flucarbazone-sodium and flucetosulfuron in the range of 0.000 5 mg/L-0.05 mg/L under the optimal conditions，the correlation coefficients（r）were greater than 0.998，and the quantitation limits of the method were 0.005 mg/kg both for flucarbazonesodium and flucetosulfuron.The mean spiked recoveries of flucarbazone-sodium and flucetosulfuron at three concentration levels of 0.005，0.02，0.1 mg/kg were in the range of 92.8%-110.3%and 85.2%-97.6%，with relative standard deviations （RSDs，n=6）of 3.42%-9.27%and 3.65%-10.35%.The method is simple，rapid，sensitive，and cheap，it could meet the requirements for the detection of flucarbazone-sodium and flucetosulfuron in tea.