青菜中多种农药残留量的分析方法

采用固相萃取、液液分配的提取净化方法 ,用配有石英毛细管柱及电子捕获检测器的气相色谱仪 ,一次测定小青菜中 8种类型有机磷、有机氯和拟除虫菊酯农药 (敌敌畏 ,α 六六六 ,β 六六六 ,γ 六六六 ,δ 六六六 ,五氯硝基苯 ,甲基对硫磷 ,三唑酮 ,op′ 滴滴滴 (op′ DDD) ,pp′ 滴滴滴 (pp′ DDD) ,op′ 滴滴涕 (op′ DDT) ,pp′ 滴滴涕 (pp′ DDT) ,氰戊菊酯 ,溴氰菊酯 )的残留量。结果表明 :8种类型农药在 4 0min内可得到很好的分离。检测方法的线性相关系数r≥0 992 0 ,回收率为 70 87%～ 85 85 % ,最低检测限为 0 5 0～ 1 4 0 μg·kg-1 。

气相色谱法测定金银花中有机氯杀虫剂残留量

Using gas chromatography (GC), the organochlorine insecticide residues were determined in Lonicera japonica Thunb. flowers. The results showed that the amount of organochlorine insecticide in L. japonica flowers collected from Fengqiu in He’nan Province, Pingyi in Shandong Province was less than 0.01 mg·kg -1. The average recoveries added in samples were 93.54%-98.85%, RSD≤6.8%. It shows that the amount of organochlorine insecticide in L. japonica flowers accords with the demands of traditional Chinese medicine production.