一次性餐盒材料中全氟辛酸和全氟辛烷磺酸沥出性研究

ANALYSIS OF LEACHABLE PERFLUOROOCTANIC ACID AND PERFLUOROOCTANIC SULFONIC IN DISPOSABLE LUNCH BOXES

利用高效液相色谱-串联质谱检测方法对一次性餐盒材料中可沥出性全氟辛酸(PFOA)和全氟辛烷磺酸(PFOS)进行了研究.分别选取水、3%乙酸(W/W)、15%乙醇(V/V)和正己烷4种浸取液模拟餐盒材料在使用过程中可能接触到的水性、酸性、酒精类和油脂类条件.材料经4种溶液浸提后,浸取液用固相萃取净化和浓缩,目标分析物PFOA和PFOS采用内标法进行定量.研究表明,一次性餐盒材料在模拟条件下中有以PFOA为主的全氟类化合物从材料中沥出,其中酸性环境对PFOA的浸取率最高(2296ng.m-2),为其它3种方法的82.8倍;4种浸提条件下PFOS的沥出率都比较低,浓度仅为0.7ng.m-2—5.4ng.m-2.

The leachability of perfluorooctanic acid （PFOA） and perfluorooctanic sulfonic （PFOS） from disposable lunch boxes materials under 4 food stimulant conditions was investigated with the HPLC/MS/MS method, using MPFOA and MPFOS as the internal standard, respectively. Four kinds of solvents were selected to simulate the exposure of food to the plastic materials, which were distilled water, 3% acetic acid （W/IV）, 15% ethanol （V/V） and n-hexane. The two compounds in the stimulant solvents were extracted using the Supelclean LC-18 SPE （3cc） cartridges. It was indicated that foodstuff can be very likely contaminated by perfluorinated compounds during the usage of disposable lunch boxes, and that much higher level of PFOA （about2296 ng· m^-2）was detected in the stimulant solvent of 3% acetic acid after contact with the disposable lunch box for 4 h. Generally, PFOS can hardly be leached out under the four conditions.