为更准确、简便地检测青菜中毒死蜱与氯氰菊酯残留，采用气相色谱-微池电子捕获检测器法(GC-μECD)，建立了同时测定青菜中这2种农药残留量的分析方法。样品采用乙腈超声提取，过弗罗里硅土固相萃取柱净化，用丙酮/正己烷（1：9，V/V）淋洗，淋洗液水浴蒸发近干后以正己烷定容，应用HP-5毛细管柱程序升温分离，微池电子捕获检测器测定，外标法定量。毒死蜱和氯氰菊酯的线性范围分别为0.005~5mg/L和0.01~5 mg/L，相关系数（r）均大于0.99，添加浓度在0.1~1mg/kg时，平均回收率为84.2%～116.9%，相对标准偏差（RSD）为2.4%~12.7%，检出限分别为0.0002mg/kg和0.003 mg/kg。该方法简便、快速、灵敏，准确度及精密度均满足农药多残留检测的要求，适用于青菜中毒死蜱和氯氰菊酯残留量的检测分析。

In order to simultaneously determine residues of chlorpyrifos and cypermethrin in Brassica chinensis L. more accurately and more conveniently, a gas chromatographic method with micro-electron capture detector (GC-μECD) was developed. The pesticide residues were extracted from greengrocery with aceonitrile under ultrasonic wave and the extract was cleaned-up by self-made florisil solid-phase extraction column and eluted with acetone/n-hexane（1:9, V/V）. The eluent from column was evaporated to near dryness in water-bath with constant temperature and diluted with n-hexane to volume. The analytes were separated by a heated HP-5 capillary column, determined by GC with μECD and quantified by external standard of the peak area. The liner range of chlorpyrifos and cypermethrin were 0.005~5mg/L and 0.01~5 mg/L, with correlation coefficients（r）higher than 0.99. Mean recoveries of two analytes in Brassica chinensis L. ranged from 84.2% to 116.9% at spiked levels of 0.1~1mg/kg, and the relative standard deviations（n=3）from 2.4% to 12.7%. Limits of detection for chlorpyrifos and cypermethrin were 0.0002mg/kg and 0.003mg/kg, respectively. The method is simple, rapid, sensitive and can meet the requirements of pesticide residue analysis on accuracy and precision, thus practical for the simultaneous analysis of chlorpyrifos and cypermethrin residues in Brassica chinensis L..