马拉松、乐果两种农药单剂的含量测定,均有部颁标准。但混合乳剂中有效成份的测定,未见报道。因此,我们就这两种农药混合乳剂的分析方法进行了探讨。 马拉松、乐果这两种农药均为硫代磷酸酯类杀虫剂,除有效成份外,还含有很多杂质,不能采用一般化学法定量测定。我们采用薄层分离后,再进行定量。经多次试验,在硅胶G薄层上,用正乙烷——丙酮(7:3),石油醚——乙酸乙酯(8:2)为展开 Marathon, dimethoate two kinds of pesticide single-dose determination, both ministerial standards. However, the determination of active ingredients in the mixed emulsion has not been reported. Therefore, we discussed the analytical methods of these two pesticide mixed emulsions. Marathon, dimethoate two pesticides are phosphorothioate insecticides, in addition to the active ingredient, but also contains many impurities, can not be determined by general chemical method. We use thin layer separation, and then quantitative. After many experiments, silica gel G thin layer, with n-hexane - acetone (7: 3), petroleum ether - ethyl acetate (8: 2)