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环境化学  2015 

叶类蔬菜有机氯农药残留测定过程中的提取和净化

Keywords: 有机氯农药,蔬菜分析

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Abstract:

用柱萃取法提取,气相色谱电子捕获检测器(GC-ECD)测定蔬菜中的多种有机氯农药.比较了不同提取溶剂对蔬菜中有机氯农药的提取效率.就回收率而言,正己烷和丙酮(V/V,4∶1)>石油醚和丙酮(V/V,4∶1)>二氯甲烷和丙酮(V/V,4∶1)>纯正己烷.用正己烷和丙酮作提取溶剂时,12种有机氯农药中有10种的回收率在80%以上,变异系数在1%—15%之间.不同固相萃取(SPE)填料对有机氯农药的纯化效率为硅胶对目标物质的净化效率要高于硅藻土和氟罗里硅土,硅胶做填料时变异系数在15%以下.因此,本实验认为用正己烷和丙酮(V/V,4∶1)做提取剂、选择硅胶做填料能够对蔬菜中多种有机氯农药有较好的提取和净化效果,是一种较理想的蔬菜中有机氯农药的分析方法.

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