气体中二氧化碳浓度的测定结果不确定度评定

Evaluation of Uncertainty of Carbon Dioxide Concentration in Gas

二氧化碳是高纯氮、高纯氩、高纯氢、高纯氧等高纯气体中常见的杂质气体,其含量是许多高纯气体主要质量指标之一。本研究采用氢焰离子化检测器气相色谱(GC-FID)测量盲样氮气中CO 2的浓度,对测量的不确定度进行了分析,找出不确定度的来源,建立了数学模型,对各个不确定度分量进行了评定,结果表明影响其测量不确定度的主要因素是标准气体中CO 2浓度产生的不确定度。

Carbon dioxide is a common impurity gas in high-purity gases such as high-purity nitrogen,high-purity argon,high-purity hydrogen,and high-purity oxygen.Its content is one of the main quality indicators of many high-purity gases.In this study,the concentration of CO 2 in blind sample nitrogen was measured by GC-FID,the uncertainty of measurement was analyzed,the source of uncertainty was found,the mathematical model was established,and the uncertainty components were evaluated.The results showed that the main factor affecting the uncertainty of measurement was the uncertainty of CO 2 concentration in standard gas.