Abstract: Gas chromatography was used for the separation and determination of beta-cypermethrin and malathion in mixed agent. Dipentyl phthalate was selected as internal standard．Under the selected conditions，the retention times of malathion，internal standard and beta-cypermethrin were 8.273min，9.280min and 12.297min respectively. RSD’s（n=7）for beta-cypermethrin and malathion were found to be 0.99% and 1.23% respectively，and the average recoveries were 100.5% and 100.9% respectively. The linear correlation coefficients were 0.9997 and 0.9987 respectively．

摘要： 以邻苯二甲酸二戊酯为内标物，用程序升温法对20%高效氯氰菊酯和马拉硫磷复配制剂进行了有效成分的气相色谱分析研究。马拉硫磷、内标物和高效氯氰菊酯的保留时间分别为8.2 min、9.3 min和12.3 min；高效氯氰菊酯和马拉硫磷的变异系数分别为0.99%和1.23%；平均回收率分别为100.5%和100.9%；线性相关系数分别为0.9997和0.9987。