目的 建立黃芩中的六六六（BHC）、滴滴涕（DDT）和五氯硝基苯（PNCB）3種農(nóng)藥殘留量的毛細(xì)管氣相色譜測(cè)定方法。方法 樣品采用丙酮-二氯甲烷為提取溶劑，以超聲法提取，采用磺化法凈化。檢測(cè)使用彈性毛細(xì)管柱為分離柱，電子捕獲檢測(cè)器（ECD）檢測(cè)。結(jié)果 3種成分在25 min內(nèi)得到良好的分離；兩個(gè)色譜峰之間的分離度最小為1.57，峰與峰之間達(dá)到良好分離；該法中9個(gè)農(nóng)藥殘留物組分的線性關(guān)系良好，其平均加樣回收率為72.20%～116.18%，RSD值為0.55%～7.81%。結(jié)論 該法準(zhǔn)確，靈敏度高，易操作，重復(fù)性良好。

Objective To establish a capillary gas chromatographic (GC) method to determine residues of benzene hexachloride (BHC), dichloro-diphenyl-trichloroethane (DDT), and pentachloronitrobenzene (PCNB) in Scutellariae Radix. Methods The pesticide in samples was extracted online with acetone-dichloromethane as extraction solvent, using ultrasonic extraction and sulfonating purification, petroleum ether as final solvent. Capillary column was used as detached dowel, and the determination was carried out by electron capture detector. Results The three pesticides were separated fully in 25 min. The number of theoretical plates complied with requirements in Chinese Pharmacopoeia; the minimum resolution is 1.571, any peaks were separated completely. There was a good linear relationship among the nine pesticide residues. The average recovery rate was 72.20%—116.18%, and RSD values were 0.55%—7.87%. Conclusion The method is accurate, highly sensitive, easy in operation, and has good reproducibility.