食品中邻苯二甲酸酯类增塑剂含量的测定

Determination of Phthalate Plasticizers in Foods

采用气相色谱法测定14种食品中5种邻苯二甲酸酯[邻苯二甲酸二甲酯(DMP)、邻苯二甲酸二乙酯(DEP)、邻苯二甲酸二乙酯(DBP)、邻苯二甲酸二(2-乙基己基)酯(DEHP)、邻苯二甲酸二正辛酯(DnOP)]的含量。样品经正己烷溶解、超声波辅助提取、固相萃取浓缩富集等预处理,以保留时间定性,外标法定量。结果表明,该分析条件下样品的回收率为72.3%～101.5%,相对标准偏差为2.69%～5.84%,说明本方法准确可靠。14种食品中检出的邻苯二甲酸酯类约69%的含量高于欧洲规定的每天0.3mg/kg体重的标准,表明邻苯二甲酸酯类污染物在被检食品中有较大的的迁移。

A capillary gas chromatographic method with flame ionization detector （GC-FID） for the detection of five phthalates dimethyl phthalate （DMP）, di-ethyl phthalate （DEP）, di-butyl phthalate （DBP）, di-（2-ethylhexyl） phthalate （DEHP） and dioctyl phthalate （DnOP） in 14 kinds of foods was developed. The samples were extracted with hexane by ultrasonically assisted procedure. The extracts were cleaned up with SPE and determined by GC. Retention time of the peaks was applied for qualitative analysis, and external standard method was used for quantitative analysis. Results showed that the recoveries of the five phthalates are between 72.3% and 101.5% with relative standard deviations of 2.69%～5.84%. Consequently, this method is accurate and credible. In Europe, the total tolerable daily intake （TTDI） of total phthalate esters per person has been estimated to be 0.3 mg/kg body weight. The contents of about 69% of the phthalates detected in foods are more than 0.3 mg/kg, over the Europe standard. This indicates that there is quite high concentration of the phthalates migrating into foods.