毛细管气相色谱法测定塑料包装及包装内食品中酞酸酯

建立了用毛细管气相色谱-氢火焰离子化检测器测定塑料食品袋及袋内包装食品中5种酞酸酯(邻苯二甲酸二甲酯(DMP)、邻苯二甲酸二乙酯(DEP)、邻苯二甲酸二丁酯(DBP)、邻苯二甲酸二正辛酯(DOP)和邻苯二甲酸二(2-乙基己基)酯(DEHP))的方法。样品用无水乙醇超声提取,经干燥脱水过0.45μm滤膜过滤,直接注入气相色谱仪进行分析。用保留时间定性,外标法定量。5种酞酸酯的回收率为71.5%～125.5%;精密度(RSD)为1.6%～3.2%;DMP、DEP、DBP、DOP和DEHP的检测限分别为0.18、0.13、0.13、0.15和0.14ng。该方法准确度和灵敏度高,样品用量少,前处理简单,可同时测定塑料食品袋及包装内食品中5种酞酸酯。

Analysis of Phthalates in Food Bags and Packed Food with Capillary Gas Chromatography

A capillary gas chromatographic method with flame ionization detector (GC-FID) for the detection of the fivephthalates (dimethyl pthalate (DMP), diethyl phthalate(DEP), di-n-butyl phthalate(DBP), di-n-octyl phthalate (DOP), and di (2-ethylhexyl ) phthalate (DEHP)) respectively in food-packaging bags and the packed food was developed. The food-packaging bags were extracted with ethanol by ultrasonic. The supernatant was dehydrated and filtrated through membrane with 0.45μm diameter. The filtrate was injected into the GC system for analysis. Retention times of the peaks could be used for qualitative analysis. External standard method was used for quantitative analysis. The recoveries of the five phthalates were between 71.5% and 125.5%. The relative standard deviations were between 1.6% and 3.2%. The detection limits of the method were: 0.18ng for DMP, 0.13ng for DEP, 0.13ng for DBP, 0.15ng for DOP and 0.14ng for DEHP, respectively. The method presents the advantages of high precision, high sensitivity, small sample size, and simple pretreatment. The method can be used to test the five phthalates respectively in food-packaging bags and the packed food.