气相色谱-负化学离子源质谱法分析大葱中28种农药残留

Determination of Multi-Pesticide Residues in Scallion by GC-NCI-MS

气相色谱一负化学离子化质谱法(GC-NCl-MS)同时分析了大葱中28种农药残留。试样用乙腈提取,PSA/SAX柱净化,采用GC-NCI-MS的选择离子监测方式(SIM)对28种农药残留进行定性与定量分析。28种农药残留的检测限为0.0002～0.05mg/kg。在0.01～0.1 mg/kg添加水平,大葱中农药的的平均添加回收率为71.6%～116.8%。

A method is described for the determination of multi-pesticide residues in scallion by GC-NCI-MS.Scallion samples were extracted with acetonitrile and the extracts were cleaned up by SPE column filled with mix type SAX-PSA,followed by determination with GC-NCI-MS at selected ion monitor mode（SIM）.The detection of the all pesticides were 0.0002～0.05 mg/kg.When the spiked concentrations were 0.01～0.1 mg/kg,all the recoveries of pesticide in scallion were 71.6%～116.8%.