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Research on Gas Reference Material of C4F7N in Carbon Dioxide |
WANG De-fa1,ZHANG Ti-qiang1,HAN Qiao1,LIU Zhi-yong1,WANG Yan-wu2,YAN Xiang-lian3 |
1. National Institute of Metrology, Beijing 100029, China
2. Henan Relations Co. Ltd., Zhengzhou, Henan 450001, China
3. China Electric Power Research Institute, Beijing 100192, China |
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Abstract Research on gas reference material of C4F7N in carbon dioxide was reported. The gas mixture was prepared by filling pure C4F7N and carbon dioxide into cylinder. The certified value was from gravimetric method. The impurities in parent gas were determined. The long-term stability of this reference material was evaluated by both classical stability study and isochronous stability study. Results showed it had good stability in six month. The relative expanded uncertainty is 0.5% (k=2) for the mole fraction from 1% mol/mol to 30% mol/mol.
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Received: 12 February 2019
Published: 19 January 2021
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