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以25%毒死蜱-阿维菌素乳油为研究对象,采用顶空气相色谱,对农药乳油中二氯甲烷、三氯甲烷、1,1,1-三氯乙烷、苯、1,2-二氯丙烷、四氯乙烯和1,1,2,2-四氯乙烷7种有害助剂含量的多组分同时测定方法进行了研究。样品于顶空瓶中用体积分数为20%的二甲基甲酰胺水溶液溶解,密封后上下翻转15次,室温下静置过夜,80℃水浴30 min后,取顶空气体进行测定。方法的线性决定系数大于0.995 0,除四氯乙烯和1,1,2,2-四氯乙烷外,其他5种助剂的添加回收率在74.4%～102.8%之间,定量限(LOQ)为0.2～5.0 mg/L。采用所建立方法对5种市售农药乳油中7种助剂的含量进行了分析,有部分助剂被检出。
A 25% chlorpyrifos-avermectin EC was used as the research object. Headspace gas chromatography (GC-MS) was used to determine the content of chlorpyrifos in dichloromethane, chloroform, 1,1,1-trichloroethane, Chloropropane, tetrachlorethylene and 1,1,2,2-tetrachloroethane seven kinds of harmful additives content of multi-component simultaneous determination of the method were studied. The sample was dissolved in dimethylformamide aqueous solution with a volume fraction of 20% in a headspace bottle. After sealing, the sample was turned upside down for 15 times. After standing at room temperature overnight, the headspace gas was taken for determination after 30 min of water bath at 80 ° C. The linear determination coefficient of the method was greater than 0.995 0. The recoveries of the five other auxiliaries except tetrachlorethylene and 1,1,2,2-tetrachloroethane ranged from 74.4% to 102.8%. The limit of quantification (LOQ ) Is 0.2 to 5.0 mg / L. Using the established method, the contents of seven kinds of additives in five kinds of commercially available pesticide EC were analyzed, and some of the additives were detected.