黄芪中41种有机磷农药残留测定

目的:建立同时测定黄芪中41种有机磷农药残留的方法。方法:采用毛细管气相色谱法。样品用40mL乙腈冰浴超声提取30min,用气相色谱配备火焰光度检测器进行测定:色谱柱为ZB-1701毛细管柱(30m×0.25mm×0.25μm),进样口温度为250℃,检测器温度为250℃,不分流进样。结果:41种有机磷农药最小检出限在0.9～22.5μg.kg-1之间,平均回收率在70.6%～113.9%之间,RSD在0.2%～14.1%之间。结论:本方法操作简便,回收率、准确度、精密度均符合农药残留分析的要求,可用于黄芪中41种有机磷农药残留的快速检测。

Residual Determination of 41 Organophosphorus Pesticides in the Astragali Radix

OBJECTIVE：To establish the method for the simultaneous determination of 41 residual organophosphorus pesticides in Astragali Radix.METHODS：Capillary gas chromatography was adopted.Samples were extracted on ice for 30 min ultrasound with 40 mL acetonitrile.The sample was determined by GC equipped with flame photometric detector（FPD）.The ZB-1701 capillary column（30 m×0.25 mm×0.25 μm） was adopted.The injecton port temperature was 250 ℃ and detector temperature was 250 ℃ with unsplitting injection.RESULTS：The minimum detectable limit of 41 oganophpsphorus pesticides was from 0.9 to 22.5 μg·kg-1.The average recovery was 70.6%～113.9% with RSD of 0.2%～14.1%.CONCLUSION：The method is simple in operation.Recovery,accuracy and precision are all meet requirements of residual pesticides analysis.It can be used for rapid determination of 41 residual oganophpsphorus pesticides.