该文采用顶空-气相色谱法对PET碳酸饮料瓶及瓶坯中乙醛含量测定分析,结果表明该方法线性关系、重现性和稳定性均良好,其线性相关系数为0.9995,检出限为0.2μg,平均回收率为98.3％,相对标准偏差为2.5％.同时其测定方法的不确定度评估表明,当试样中乙醛含量为29.7020μg/g时,测量结果的扩展不确定度为1.4436μg/g(k=2).

In this paper, the acetaldehyde content in PET bottle for carbonation drink and preform was determined with headspace-gas chromatography. The results showed that the linear relationship, reproducibility and stability of the method were good. The linear correlation coefficient, detection limitation, average recovery and relative standard deviation were 0.9995, 0.2μg, 98.3% and 2.5%, respectively. Furthermore, the uncertainty assessment of the method indicated that the expanded uncertainty of the result was 1.4436μg/g (k=2) when the acetaldehyde content in the sample was 29.7020μg/g.