气雾杀虫剂中氯氰菊酯的毛细管气相色谱内标法测定

氯氰菊酯属于高效、中等毒性的菊酯类农药,常用于配制卫生杀虫剂,开展简便、快速测定具有现实意义。本文设计了罐装气雾杀虫剂样品的取样方法,探讨了影响毛细管气相色谱内标法测定结果的影响因素,最佳测试条件:分流比50:1、载气流量1mL/min、氯氰菊酯与内标物质量比0.25~3.0,从而成功进行了罐装气雾杀虫剂样品定性、定量分析。氯氰菊酯4对异构体分离良好,25min出峰完毕。氯氰菊酯含量为0.245%,相对标准偏差2.2%,3个添加水平的平均回收率为101.7%~103.2%,方法的检出限为4g/L。研究结果对产品质量控制具有参考价值。

Determination of Cypermethrin in Aerosol Insecticides by Internal Standard Method of Capillary Gas Chromatography

Cypermethrin is a highly efficient pyrethroid pesticides with medium toxicity, which can be commonly used as the active ingredients of household pesticides. It is very important to study simple, rapid detection. A Sampling method was designed for canned aerosol insecticides. The factors affecting the results of internal standard method of capillary gas chromatography were discussed. The optimal conditions for analysis： split ratio being 50：1, carrier gas flow being 1 mL / min, the mass ratio of cypermethrin to internal standard being from 0.25 to 3.0. The qualitative and quantitative analysis of cypermethrin in a canned aerosol insecticide sample was successfully conducted. Four pairs of cypermethrin isomers were well separated within 25 min. The content of cypermethrin was 0.245% with the relative standard deviation of 2.2%. The average recovery at three levels was 101.7% ～103.2% with the detection limit of 4 g/L. The results of this paper had reference value for the quality control.