建立了气相色谱法同时测定蔬菜中毒死蜱、氯氰菊酯和氰戊菊酯残留量的分析方法.采用HP-5石英毛细管柱(30 m×0.25 mm,0.25 μm)和电子捕获检测器测定,用3种农药的基准物质配成混合标准溶液制作浓度范围在0.02~0.20 mg·L-1之间的校正曲线,3条曲线的相关系数分别为0.999 4,0.999 4和0.998 9.样品加标回收率为85.3%~93.1%,相对标准偏差为0.13%~2.16%,检出限分别为0.001,0.002和0.002 mg·kg-1.

Gas chromatography was applied to the simultaneous determination of 3 pesticides,i.e.chlorpyrifos,cypermethrin and fenvalerate,in vegetables,and HP-5 quartz capillary column (30 m×0.25 mm i.d.×0.25 μm) and electron capture detector (ECD) were used in the separation and detection.Chromatographic parameters were described in detail.It was found that better efficiency of extraction and higher recovery were obtained by using petroleum ether as extractant than by using mixed solvents as extractant;and that the efficiency of purification was quite satisfactory by the use of the floridin silicious clay.A mixed standard solution was prepared from primary standards of the 3 pesticides,and calibration curve for each of the 3 pesticides was prepared covering the concentration ranges of 0.02 to 0.20 mg·L-1.The correlation coefficients of these calibration curves were 0999 for chlorpyrifos and cypermethrin,and 0.998 for fenvalerate;and their detection limits were 0.001,0.002 and 0.002 mg·kg-1 respectively.Recovery tests by addition of standard solutions at 3 concentration levels on the base of blank vegetable samples gave results in the range of 85.3% to 93.1%,and RSD′s obtained were in the range of 0.13% to 2.16%.