Simultaneous determination of 6 pesticide residues in tea by QuEChERS-GS-MS/MS

Objective: This study aimed to establish a method by using QuEChERS-gas chromatography tandem mass spectrometry (GC-MS/MS),to determine six pesticide residues in tea,including: hydroprene,kinoprene,genite,fluronitrofen, cycloprate,and chlornitrofen.Methods: The samples were pretreatedby QuEChERS method.They were separated by gas chromatographic, detected by multiple reaction monitoring (MRM)mode and quantified by the external method.Result: All the pesticide residues showed good linearity with correlation coefficients above 0.999 when the concentration falls in the range 0.025~2.000 mg/kg,and the limits of quantitation were in the range of 0.0006 ~0.0072 mg/kg.In the recovery experiment of 0.002 5 mg/kg,0.05 mg/kg,and 0.5 mg/kg at three concentrations,the average recoveries were 84.3%5~116.3%, and the relative standard deviations (RSDs) were 1.07% ~ 6.05%.Conclusion: The method is rapid,simple,and accurate, which is suitable for the detection of these six pesticide residues intea.