气相色谱法测定花草茶中3种农药残留量

建立了花草茶中六六六、滴滴涕及三氯杀螨醇农药残留量的气相色谱分析方法。试样以石油醚（30~60 ℃）为提取剂，浓硫酸净化，采用RTX-1型毛细管分离，以ECD为检测器测定样品中六六六、滴滴涕及三氯杀螨醇农药残留量。结果表明，六六六、滴滴涕及三氯杀螨醇在0.02~1.00 μgmL范围内线性关系良好（R≥0.998 3），检出限为0.001~0.002 μgmL，加标回收率均为92.5%~110%。该方法操作便捷，适用范围广，适于花草茶中六六六、滴滴涕及三氯杀螨醇的农药残留检测。 

Determination of 3 Pesticides in Herbal Tea by Gas Chromatography

A gas chromatographic method for determination of BHC，DDT and dicofol in herbal tea was established.Petroleum ether was used as extract solvent，then samples were cleaned up by sulphuric acid.BHC，DDT and dicofol residue in samples separated by RTX-1 capillary column，EDC was used as detection.Results showed that a good linearity was obtained for BHC，DDT and dicofol with the relative coefficient larger than 0.998 3，the limit detection（LOD）of method was 0.001~0.002 μgmL，the percentage recovery from the samples was between 92.5%~110%.The method was handle easily and rapid，wide range of application，it could be used to determine BHC，DDT and dicofol in herbal tea.