烟草中二硫代氨基甲酸酯农药残留量的测定

Determination of Dithiocarbamate Pesticide Residues in Tobacco by Gas Chromatography-Mass Spectroscopy

为提高烟草中农药残留量的检测效率,建立了一种快速测定二硫代氨基甲酸酯类农药的方法。在密闭系统中,试样中的二硫代氨基甲酸酯在加热、超声条件下与还原性酸溶液反应,分解产生的二硫化碳经过异辛烷吸收后用气相色谱/质谱联用法(GC/MS)检测,以二硫化碳的含量表示二硫代氨基甲酸酯残留量。结果表明:方法的回收率在90.4%～106.0%之间,相对标准偏差(RSD)在3.2%～9.5%之间,定量限为0.017 mg/kg。该法可用于批量烟草样品中二硫代氨基甲酸酯类农药残留量的快速检测。

A method was presented for the analysis of dithiocarbamate pesticide residues in tobacco,in which tobacco was put into a closed-conical flask,the residues of dithiocarbamate pesticides in tobacco were extracted and hydrolyzed to CS2 under ultrasonic conditions,then CS2 trapped in a layer of iso-octane overlaying the reaction mixture was taken for gas chromatography-mass spectroscopy analysis.The recoveries ranged from 90.4% to 106.0% with the relative standard deviations（RSD） of 3.2% to 9.5% and the limit of quantification（LOQ） of 0.017 mg/kg.This method can be used for the fast analysis of the dithiocarbamate pesticide residues in tobacco.