氦气分析用杂质成分气体标准物质研制

Development of gas standard substance for helium analysis with impurity component

采用称量法研制了氦气中微量氖、氢、氧、氮、甲烷、二氧化碳和一氧化碳7种杂质成分气体标准物质,介绍了称量法制备技术、稀释气中相关杂质的定量等过程,并分别用F检验和回归曲线法对研制的气体标准物质进行了均匀性和稳定性检验。结果表明,研制的氦气分析用杂质成分气体标准物质具有良好的均匀性和稳定性,气体标准物质定值结果为10μmol/mol,定值结果的相对扩展不确定度为1%(k=2)。

Neon,hydrogen,oxygen,nitrogen,methane,carbon dioxide and carbon monoxide in helium gas standard material was developed by weighing method.The weighing method technology and quantitative process of impurities in dilute gas were introduced.F-test and regression curve method were used to test the homogeneity and stability of the gas reference material.The results shown that the gas reference material developed for helium analysis was uniform and stable.The contents of impurities in gas reference material were 10μmol/mol,and the relative extended uncertainty of the gas reference material was 1%(k=2).