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建立了同时测定中药中8种有机磷农药残留量的前处理及其毛细管气相色谱测定法 ,选用氮磷检测器和SPB -1701毛细管柱,以丙酮 -石油醚混合溶剂提取残留农药。结果表明 :敌百虫、敌敌畏、甲胺磷、二嗪农、乐果、马拉硫磷、甲基对硫磷和对硫磷8种农药在25min内有良好的分离 ;3个不同浓度的标准添加 ,其回收率范围为74.96 %～116.8 % ,相对标准偏差范围为0.71 %～16.91 % ;检出限范围为1.1×10-2～3.36×10-1 pg。该法具有灵敏度高、选择性强、操作简便、重现性好、适用性广等特点 ,有着良好的应用前景。
The pretreatment and capillary gas chromatographic determination of 8 organophosphorus pesticide residues in Chinese medicine were established. The nitrogen and phosphorus detector and SPB-1701 capillary column were used to extract residual pesticides with acetone-petroleum ether. The results showed that the eight pesticides such as trichlorfon, dichlorvos, methamidophos, diazinon, dimethoate, malathion, methyl parathion and parathion were well separated in 25 minutes. Three different concentrations of Standard addition, the recoveries ranged from 74.96% to 116.8%, and the relative standard deviations ranged from 0.71% to 16.91%. The limits of detection ranged from 1.1 × 10-2 to 3.36 × 10-1 pg. The method has the characteristics of high sensitivity, strong selectivity, easy operation, good reproducibility and wide applicability, and has a good application prospect.