浓硫酸纯化-气相色谱法测定土壤中拟除虫菊酯农药残留

Determination of Residues of Pyrethriods in Soil by Gas Chromatography with H_2SO_4 Purification

建立了土壤中拟除虫菊酯类农药新的前处理方法。样品以乙腈提取,浓硫酸-乙醇进行纯化,毛细管柱气相色谱法测定土壤中的拟除虫菊酯农药。结果表明:4种菊酯在3种土壤样品中的添加回收率在84.14%～105.51%之间,变异系数为1.24%～5.82%。该方法具有省时、省溶剂、操作简单、纯化效果好、实用性强的特点。

A method for extracting, clearing off and determining the residues of cyhalothrin, escy-permethrin, fenvalerate and deltamethrin in soil was established. In this method the residues of the pesticides in soil were extracted by acetonitrile and purified by H2SO4-ethanol, then measured by GC. The recovery of the method ranged from 84.14% to 105.15%, with CV from 1.24% to 5.82%. This method was proved to be low in cost, easy in operation, and high in purification, reproductivity and feasibility.