【摘要】 利用气相色谱 质谱 (GC MS) ,电子轰击离子化 (EI)法同时测定及确证蔬菜中多种有机磷农药和克百威的残留量。对样品的前处理方法进行了选择实验。试样用乙腈提取 ,将提取液过滤后 ,加氯化钠使水相与乙腈分离 ,浓缩有机相 ,无需净化。用GC MS的选择离子监测 (SIM)方式测定其中的敌敌畏、甲胺磷、甲拌磷、氧乐果、甲基对硫磷、克百威共 6种杀虫剂的残留量并进行阳性确证。该方法的检出限量为 0 0 0 0 2mg/kg～ 0 0 1 6mg/kg,1 0种蔬菜 6种农药的标准添加 (0 0 1、0 0 2、0 1、0 2mg/kg)的回收率为 72 %～ 1 2 5 % ,测定的相对标准偏差为 6 7%～ 2 0 %。本方法可以满足这 6种杀虫剂在蔬菜中的最高残留量限量的检测要求。更多还原

【Abstract】 Organophorus insecticide and carbofuran residues in vegetables were determined by gas chromatography-mass spectrometry(GC-MS) with eletron impact(EI) ionization. The vegetable samples were treated by extroaction solvent of acetonitrile.The organic phase was then separated from water phase by adding NaCl. No clean-up step was required. Dichlorvos, methamidophos, phrate, omethoate, parathion-methyl, carbofurn were analyzed by GC-MS with selected-ion monitoring(SIM). Detection limits of 6 insecticides were 0.0002 mg/kg ～0.016 mg/kg. The recoveries of 6 insecticides ranged from 72% to 125% with relative standard deviation of 6.7%～20%.更多还原