Comparison of Purfication Effect of Different Types of SPE Column on the Dertermination of 58 Pesticide Residues in Chives

To optimize pretreatment conditions in comparing the purification effects of different types of solid phase extraction columns,a gas chromatography-mass spectrometry(GC/MS)method was established for the determination of 58 pesticide residues in chives.The samples were extracted by acetonitrile,cleaned-up with Cleanert PC/NH₂ solid-phase extractant,and determined by GC/MS using matrix-matched external standard method. The determination coefficients(R²)of all the 58 pesticides in the range of 65.2~1043.0 ng/mL were not less than 0.990. The limits of detection(LODs)were 0.001~0.007 mg/kg when signal/noise was 3(S/N=3). The limits of quantification(LOQs)were 0.003~0.024 mg/kg(S/N=10).For recovery test,there were three levels(low,medium and high)spiked in chives. The average recoveries of the method were 62.2%~125.2% and the relative standard deviations(RSDs,n=3)were 0.5%~9.5%. Compared with QuEChERS method,the method has the advantages of simple and rapid processing,high purification sensitivity and selectivity which is suitable for screening and quantitative analysis of multi-component pesticides in the chives matrix.