吉林省食用菌中二硫代氨基甲酸酯类农药残留监测及结果分析

目的建立气相色谱-质谱法测定菌类中二硫代氨基甲酸酯类农药的含量,了解吉林省内几种菌类食品中二硫代氨基甲酸酯的残留情况。方法样品在加热密闭的顶空瓶中进行前处理,进入气相色谱-质谱仪进行检测,以CS_2为检测目标物,程序升温,选择性离子监测,外标法定量。结果食用菌类中二硫代氨基甲酸酯类农药检出限为0.005 mg/kg,定量限为0.015 mg/kg,在0.02～0.5 mg/L范围内线性关系良好(r0.9990)。部分菌类食品中存在二硫代氨基甲酸酯的残留检出率为25.2%,检出浓度为0.011～0.098mg/kg,其中香菇的检出率最高为57.89%。结论吉林省内菌类食品中含有一定量的二硫代氨基甲酸酯的残留,均低于GB2763-2016中规定的最大残留量1mg/kg,但是检出率较高,需要加强日常监管。

Monitoring and analysis of dithiocarbamate pesticide residues in edible eungi in Jilin province

Objective The total content of dithiocarbamate pesticides in fungi (CS2) was determined by GC-MS. The residues of dithiocarbamate in several fungi food in Jilin Province were investigated. Methods The sample was heated and sealed in a headspace bottle, then added stannous chloride-hydrochloric acid solution to react to form carbon disulfide. After cooling, carbon disulfide was extracted with n-hexane, then n-hexane was taken out and determined by GC-MS. Results The detection limit of dithiocarbamate pesticides in edible fungi by GC-MS was 0.005 mg/kg, the quantitative limit was 0.015 mg/kg, the linearity was good in the range of 0.02-0.5 mg/L (r > 0.9990), and the conversion rate of Fumei was between 90% and 100%. The detection rate of dithiocarbamate residues in some fungi food was 25.2%. The concentration range was 0.011-0.098 mg/kg (CS2). The highest detection rate of Lentinus edodes was 0.067 mg/kg, and the detection rate was 57.89%. Conclusion GC-MS method is a better method for the determination of dithiocarbamate pesticides (CS2) in fungi food. There are a certain amount of dithiocarbamate residues in fungi food in Jilin Province, which are lower than the maximum residues of 1 mg/kg stipulated in GB2763-2016, but the detection rate is higher, which can be used as a reference for future research on dithiocarbamate pesticides.pesticides.