Preparation of Reference Material of Methane in Nitrogen
Methane gas reference material in nitrogen was prepared by weighing method.By comparing with the national standard material,the quantity value is determined.The uniformity and stability of the prepared gas reference material were evaluated by gas chromatography.The uncertainty of the fixed value was mainly introduced by the uniformity,stability and preparation process.The results show that the developed standard value of methane gas reference material in nitrogen is 92.5％(urel=1％,k=2),the standard material has good uniformity and stability,and can meet the requirements of domestic natural gas stove combustion performance test in the national standard GB/T 13611-2018 Classification and basic characteristics of city gas.
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