This paper briefly describes the preparation of gas reference material for sulfur dioxide in nitrogen by weighing method and calculating the fixed value.The level of development is guaranteed by the self-developed cylinder automatic cleaning system,gas distribution system and optimized gas distribution process flow.The preparation method,uniformity and stability of the gas reference material were studied.The results show that the relative expansion uncertainty of sulfur di-oxide in the gas materials substance for sulfur dioxide in nitrogen is U =2%and k =2.
gas reference materials for sulphur dioxide in nitrogendevelopmentgravimetric methodrelative expansion uncertainty
万方数据
维普
