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[目的]建立水中多种拟除虫菊酯类农药残留的毛细管气相色谱检测方法。[方法]采用正己烷快速混合萃取,氮吹仪吹干,再用1ml正己烷定容,采用DB-1毛细管柱分离,ECD检测器测定,外标法定量。[结果]7种拟除虫菊酯类农药能较好地分离,峰面积与其浓度均具有良好线性关系,两个水平的平均加标回收率分别为:95.0%～102.5%之间和95.1%～101.6%之间,相对标准偏差为:1.1%～5.2%之间和1.0%～6.9%之间。[结论]本法具有较高的选择性、灵敏度和准确度,完全能满足水中痕量拟除虫菊酯类农药的分析。
[Objective] To establish a capillary gas chromatographic method for the determination of pyrethroid pesticide residues in water. [Method] The mixture was extracted with n-hexane, dried with nitrogen, and then denatured with 1ml of n-hexane. The residue was separated on a DB-1 capillary column, measured by ECD detector and quantified by external standard method. [Result] The seven pyrethroid pesticides could be separated well, and the peak area and concentration had a good linear relationship. The average recoveries of the two levels were 95.0% ~ 102.5% and 95.1% ~ 101.6, respectively %, Relative standard deviation between: 1.1% ~ 5.2% and between 1.0% ~ 6.9%. [Conclusion] The method has high selectivity, sensitivity and accuracy, which can fully meet the trace pyrethroid pesticides analysis in water.