Objective:To establish an analytical method for the simultaneously determination of 20 pesticide residues in traditional Chinese herbs.To offer the evidence for the standard of safety to use of traditional Chinese herbs.Methods: The sample was extracted with acetone,and the extract was cleaned using GPC,concentrated using nitrogen blow.Based on GC/MS the pesticides were separated on a DB-17MS column using a temperature program and were detected with a mass selective detector in selective ion monitoring(SIM)mode.The target pesticides were identified by comparing their retention times and characteristic ions with reference,used the internal reference method to determination.Results:20 Pesticides were separated within 34 minutes.Linearities of the 20 kinds pesticide were good(r=0.9970-0.9999)in ranges of 10-1000 μg·L-1.The minimum determination limited range is 0.5-2.4 μg·kg-1.The average spiked recoveries in three levels were 70%-120% with relative standard deviation(RSD)below 11%.(n=9).Conclusion:The method is sensitive for the residue analysis of 20 pesticides in traditional Chinese herbs.
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