Determination of 45 Pesticide Residues in Hops by QuEChERS Combined with Gas Chromatography-Tandem Mass Spectrometry
An analysis method was established for the determination of 45 kinds of pesticide residues in hops by quick,easy,cheap,effective,rugged,and safe(QuEChERS)combined with gas chromatography-mass spectrometry(GC-MS/MS).The samples were extracted with acetonitrile acetate,and then clean-up was carried out by QuEChERS and Z-Sep,develop a external standards quantitative method for pesticide residues through GC-MS/MS.The 45 pesticides in this method had a good linear correlation in the range of 0.010-0.500 mg/L,the correlation coefficients(R2)greater than 0.998.In three different concentration levels of 0.03 mg/kg,0.05 mg/kg and 0.10 mg/kg,the average recoveries were 66.7％-106.0％with the relative standard deviations(n=6)between 0.41％and 8.95％,and limit of quantitative was 0.01 mg/kg.The method is simple,rapid and accurate,which is suitable for determination of pesticide residues in hops.
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