Determination of 9 Pesticide Residues in Chinese Chives by Modified QuEChERS-ultra Performance Liquid Chromatography-tandem Mass Spectrometry
Based on QuEChERS and ultra-high performance liquid chromatography-tandem mass spectrometry(UPLC-MS/MS),a method for simultaneous detection of 9 pesticide residues in Chinese chives was established,including Carbendazim,Procymidone,Imidacloprid,Acetamiprid,Orthene,Chlorpyrifos,Methamidophos,Pendimethalin,Omethoate.The Chinese chive samples were extracted by acetonitrile,cleaned-up by QuEChERS method and then determined by optimized UPLC-MS/MS method in multi-reaction monitoring(MRM)mode,quantified by matrix matching external standard method.The results showed that carbendazim had a good linear relationship in 1～200 μg/kg,procymidone in 5-500 μg/kg and the other 7 pesticides in 1～500 μg/kg,with R above 0.99 and limit of quantification up to 10 μg/kg.The recoveries for all compounds spiked at levels of 10,50,100,200 μg/kg,which are ranged from 70%to 115%,with relative standard deviations(RSDs)are 0.6%～6.7%.The method was simple,efficient,reliable,and was suitable for simultaneous determination of 9 pesticide multi-residues in Chinese chives within 4 min.
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