Preparation and Uncertainty Analysis of Gas Reference Material of Carbon Dioxide in the Air
The manuscript describes the development process of(500×10-6～5.00×10-2)mol/mol carbon dioxide gas refer-ence materials in the air.The gas reference materials was prepared by the weighing method using high-purity nitrogen,high-purity oxygen and carbon dioxide as raw materials.The homogeneity and stability of the prepared sample gas concen-trations were checked using a gas analyzer,and the accuracy of the weighing method was verified by comparison.The rela-tive extended uncertainty U=1%(k=2)of the gas reference materials can provide metrological traceability support for car-bon dioxide gas analyzers,gas chromatographs and alarms.
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