GC-μECD测定蔬菜粉中二硫代氨基甲酸盐(酯)类农药残留

摘要

二硫代氨基甲酸盐(酯)(DTCs)类农药在SnCl2-HCl溶液中酸解生成CS2气体，CS2气体被正己烷吸收后，使用气相色谱-电子捕获检测器测定CS2含量，即可得到DTCs农药的残留量。采用该方法测定蔬菜粉中代森锰锌、代森联、丙森锌残留，在添加水平为10μg时，平均回收率为79.8%～93.4%，相对标准偏差为1.9%～4.6%。方法的检出限为0.01～0.04 mg/kg，定量限为0.3～1.0 mg/kg。该方法简单、准确，适用于农产品中DTCs农药的残留检测。%The dithiocarbamate residues were decomposed to carbon disulfide (CS2) in SnCl2-HCI solution.The liberated CS2 was absorbed by hexane,and then determined by gas chromatography with electron capture detection (μECD), the results were expressed as the residues of dithiocabamates. The residues of mancozeb, metiram and propineb in vegetable powder were determined by GC-μECD. The results showed that at the fortified level of 10μg, the average recoveries ranged from 79.8% to 93.4% with the relative standard deviations (RSD) of 1.9%-4.6%. The limits of detection of the 3 dithiocarbamates residues in the vegetable powder were 0.01-0.04 mg/kg, and the limits of quantification were 0.3-1.0 mg/kg. The method was simple, accurate, reproducible, and suitable for the determination of the dithiocarbamate residues in agricultural products.