氮中一氧化氮、二氧化硫、一氧化碳气体标准物质的研制

Preparation of Gas Reference Material For Nitric Oxide,Sulfur Dioxide and Carbon Monoxide in Nitrogen

介绍了氮中一氧化氮、二氧化硫、一氧化碳气体标准物质的研制过程。以高纯一氧化氮气体、高纯二氧化硫气体、高纯一氧化碳气体、高纯氮气为原料,采用称量法制备了氮中一氧化氮、二氧化硫、一氧化碳气体标准物质,采用与同基体国家一级标准物质比较的方法定值。对原料气中的杂质进行了分析,基于傅里叶变换红外光谱分析仪建立了分析方法,对制备的气体标准物质进行了均匀性和稳定性考察。结果表明:研制的氮中一氧化氮、二氧化硫、一氧化碳气体标准物质均匀性和稳定性良好,浓度特征量值范围为:一氧化氮:200~1000μmol/mol、二氧化硫:200~1000μmol/mol、一氧化碳:1000~5000μmol/mol,相对扩展不确定度为1.5%(k=2)。

Preparation of gas reference material of nitric oxide,sulfur dioxide and carbon monoxide mixed in nitrogen was reported.Using high-purity nitric oxide gas,high-purity sulfur dioxide gas,high-purity carbon monoxide gas and high-purity nitrogen as parents gases,the gas reference materials were prepared by gravimetric method,and the values were determined by comparison method.The impurities in the parent gases were analyzed.The comparision method was established based on the Fourier Transform Infrared Spectrometer.The homogeneity and stability of the prepared gas reference materials were investigated.The results showed the homogeneity and stability of the gas reference materials were well.The ranges of property values of nitric oxide,sulfur dioxide and carbon monoxide were 200~1000μmol/mol,200~1000μmol/mol,1000~5000μmol/mol respectively,with the relative expanded uncertainty 1.5%(k=2)for all.