中文摘要：

目的：关于天麻中8种有机氯农药的毛细管气相色谱测定方法的研究。方法：样品经有机溶剂超声波提取，用HP-5石英柱程序升温技术分离，电子捕获检测器检测，外标法计算含量。结果：样品的平均回收率为80％．95．6％；RSD为4．9％～6．0％；被测样品均有不同程度的农药残留。结论：本方法快速、简便、准确，具有良好的通用性，可用于天麻中8种有机氯农药残留量的测定。

英文摘要：

Objective ：To determine 8 organochloride pesticides in Gastrodia elata B1. by capillary gas chromatography with electron capture detector（ CGC -ECD）. Method：Samples were extracted with petroleum ether using supersonic fluid extraction. The column was HP - 5 （ 30 m × 0. 32 mm × 0. 25 μm ）. The injector temperature was 250 ℃ and the detector temperature was 320 ℃. The column temperature program was initial temperature 60 ℃, with the increasing rate of 20 ℃ · min^ -1 to 160 ℃ （ hold 5 min）, 10 ℃ · min^ -1 to 260 ℃ （ hold 2 min）. The pesticide residues were calculated by external standard method. Results：The average recoveries and RSD ranged from 80. 0% -95. 6% and 4. 9% -6. 0% respectively,at three spiked mixed organochlorine pesticide levels. Conclusion：The method is easy in operation and has good separation and repeatability.