Determination of 12 pesticides residues in tea by gas chromatography

Objective:To establish gas chromatographic method for the determination of organochlorine and organophosphorous pesticide residues in tea.Methods:The analytes were extracted with acetone and petroleum ether,purified with graphite carbon column and detected by ECD.Results:The average recoveries and relative standard deviations(RSDs)for the analysis were in the range of 79.0%～102.1% and 1.87%～3.34%%(n=5),respectively.The limits of detection were 0.008 mg/L～0.051 mg/L.Good linearities were obtained in the concentration ranging from 0.1 mg/L～15.0 mg/L,the correlation coefficients were higher than 0.9923.Conclusion:The method is simple,rapid,sensitive which can meet the needs for organochlorine and organophosphorous pesticide residues in tea.