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

Abstract

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 pretreated by QuEChERS method. They were separated by gas chromatographic, detected by multiple reaction monitoring (MRM) mode and quantified by the external method. Results: 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 0.000 6 ~0.007 2 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 in tea.

Keywords

• quechers
• gas chromatography-triple quadrupole mass spectrometer
• tea
• pesticide residue