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目的应用气相色谱分析水果中残留二硫代氨基甲酸盐(酯)类农药。方法二硫代氨基甲酸盐(酯)类农药残留定义以二硫化碳表示。在密闭加热的容器中用SnCl_2·HCl溶液酸解二硫代氨基甲酸盐类(DTCs)农药,反应生成的二硫化碳气体被瓶中的正己烷吸收,形成二硫化碳的正己烷溶液;使用气相色谱-火焰光度检测器(硫滤光片)测定有机相中二硫化碳的含量,即得到DTCs农药的残留量。采用该方法对苹果、葡萄等水果基质中残留的福美锌、福美双、代森锰锌、代森联、丙森锌进行了方法确证。结果对二硫化碳的检出限为0.01 mg/kg,在0.025 mg/L~10.0 mg/L时线性均良好(r>0.998 0),福美双转化率应在90%~110%。结论该方法快速、简单、准确、可靠。适用于水果中二硫代氨基甲酸盐(酯)类农药残留测定。
Objective To analyze residual dithiocarbamate pesticides in fruits by gas chromatography. Methods Dithiocarbamate pesticide residue definitions are given as carbon disulfide. The dithiocarbamate (DTCs) pesticides were acidified with a SnCl 2 · HCl solution in a tightly heated vessel and the carbon disulfide gas generated during the reaction was absorbed by n-hexane in the flask to form a solution of carbon disulfide in n-hexane. Gas chromatography-flame Photometric detector (sulfur filter) to determine the content of carbon disulfide in the organic phase, that is, the residual amount of DTCs pesticides. The method was applied to confirm the remaining Fumezin, thiram, mancozeb, dexmedetomidine, and propinezine residues in apple, grape and other fruit matrices. The detection limit of carbon disulfide was 0.01 mg / kg. The linearity was good (r> 0.9980) at 0.025 mg / L ~ 10.0 mg / L, and the conversion of thiram was 90% -110%. Conclusion The method is fast, simple, accurate and reliable. For dithiocarbamate pesticide residues in fruits.