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建立了测定生菜中高效氯氰菊酯残留量的气相色谱分析方法。样品采用乙腈提取,弗罗里硅土固相萃取小柱净化,正己烷-丙酮(9∶1,V/V)淋洗,HP-5石英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。高效氯氰菊酯的线性检测范围为0.05—2mg/L,相关系数为0.9997。添加浓度为0.1,0.5mg/kg和1mg/kg时,生菜中高效氯氰菊酯的平均回收率在87.5%—92.1%之间,相对标准偏差(n=5)为6.7%—12.1%。方法检出限为0.0008mg/kg,定量限为0.0028mg/kg。该方法操作简单,灵敏度、准确度和重复性良好,可用于生菜中高效氯氰菊酯的残留检测分析。
A gas chromatographic method for the determination of beta-cypermethrin residue in lettuce was established. The samples were extracted with acetonitrile, purified with Florisil solid-phase extraction cartridges, rinsed with hexane and acetone (9: 1, V / V), heated with HP-5 quartz capillary column, , External standard method. The linear detection range of beta-cypermethrin was 0.05-2mg / L and the correlation coefficient was 0.9997. The average recoveries of beta-cypermethrin in lettuce ranged from 87.5% to 92.1% and the relative standard deviations (n = 5) ranged from 6.7% to 12.1% at the concentrations of 0.1, 0.5 and 1 mg / kg. The detection limit was 0.0008 mg / kg and the limit of quantification was 0.0028 mg / kg. The method has the advantages of simple operation, good sensitivity, accuracy and repeatability, and can be used for the residue detection analysis of beta-cypermethrin in lettuce.