GC-FID法测定食品级瓶盖垫圈中五种邻苯二甲酸酯类增塑剂的含量

Determination of Five Phthalic Acid Esters Plasticizers in Food-Grade Lid Gasket by GC-FID

采用气相色谱氢火焰离子化检测(GC-FID)方法对市场销售的四种食品包装瓶盖塑料垫圈中邻苯二甲酸二(2-乙基己基)酯(DEHP)、邻苯二甲酸二异壬酯(DINP)、邻苯二甲酸二异癸酯(DIDP)、邻苯二甲酸丁基苄基酯(BBP)、邻苯二甲酸二正丁酯(DBP)五种增塑剂的含量进行了测定。该方法线性关系良好,五种化合物的相关系数为0.998 1～0.999 8,检出限为0.9～2.9μg/mL。通过实验选取了测定五种邻苯二甲酸酯的最佳提取条件:采用甲苯为提取剂,索氏提取时间为5 h。五种化合物的回收率为86.9%～103.1%,相对标准偏差(RSD)为3.75%。结果表明,酒精饮料、罐头瓶盖垫圈中含有增塑剂DEHP,含量分别为23.3%和35.5%,其余两种瓶盖垫圈中未检出这五种增塑剂。

Gas chromatography-flame ionization detection（GC-FID） analysis method is used to determine contents of five phthalic acid esters（PAEs） plasticizers,including di-2-ethylhexyl phthalate（DEHP）,di-isononyl phthalate（DINP）,di-isodecyl phthalate（DIDP）,butylbenzyl phthalate（BBP） and di-n-butyl phthalate（DBP） in four kinds of food packaging lid gaskets.The linear relation of this method is much better;and the correlated coefficients of the compounds of five kinds are 0.998 1-0.999 8;and their detection limits are in the range of 0.9-2.9 μg/mL.The best extracting conditions for determining 5 kinds of phthalic acid esters are selected via experiments;methylbenzene is adopted as the extracting solvent and the extraction time is 5 hours.The recovery rate of the five compounds is 86.9%～103.1%,and the relative standard deviation（RSD） is 3.75%.The results indicate in the four kinds of food packaging lid gasket,the content of DEHP in alcoholic drinks packaging lid gasket and can packaging lid gasket is 23.3% and 35.5% respectively,the five kinds of plasticizer are not detected in the rest of other two lid gaskets.