顶空气相色谱法测定PET碳酸饮料瓶乙醛含量的不确定度评价

Uncertainty Evaluation of Acetaldehyde Content Determination of PET Carbonated Beverage Bottles by Headspace Gas Chromatography

目的:采用顶空气相色谱仪测定PET碳酸饮料瓶中的乙醛含量,分析不确定度的来源,并对各个分量进行不确定度评估。方法:采用顶空气相色谱法对饮料瓶中乙醛含量进行检测。结果:当样品测量浓度为3.014μg·L^(-1)时,其扩展不确定度为0.102μg·L^(-1)。结论:用顶空气相色谱仪测定PET碳酸饮料瓶乙醛含量时,最大的不确定度分量的是标准曲线系列稀释过程,其次是校准曲线的拟合。

Objective: A headspace gas chromatograph was used to determine the acetaldehyde content in PET carbonated beverage bottles, analyze the source of uncertainty, and evaluate the uncertainty of each component. Method:The content of acetaldehyde in polyethylene terephthalate(PET) carbonated beverage bottles was detected by headspace gas chromatography. Result: When the sample was measured at a concentration of 3.014 μg·L-1, its expanded uncertainty was 0.102 μg·L-1. Conclusion: When determining the acetaldehyde content of PET carbonated beverage bottles with headspace gas chromatograph, the largest uncertainty component is the standard curve series dilution process, followed by the fitting of the calibration curve.