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

摘要

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5h.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 (DE-HP) ,di-isononyl phthalate (DINP) ,di-isodecyl phthalate (DIDP) ,butylbenzyl phthalate (BBP) and din-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 jxg/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.