| Autor: |
Jie He, Xing Wang, Zhe Bi, Ze Yi Zhou |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Advanced Materials Research. :394-398 |
| ISSN: |
1662-8985 |
| DOI: |
10.4028/www.scientific.net/amr.1010-1012.394 |
| Popis: |
The impact of purity of raw material on the accuracy of gas standard is studied. The R142b with purity of 99.6% and N2 with purity of 99.996% was used to prepare R142b in N2 gas standard based on gravimetric method. Results showed that if the impurity in R142b raw material was not dectected, it would cause 0.20-0.23% deviation relative to the reference value; if the uncertainty for impurity in R142b reach to 100%, the uncertainty in each step of dilution was amplified for almost 66.9%-144%, seriously reducing the reliability of the gas standard. Conversely, the neglect of 4.85×10-5 mol/mol Ar in dilutent gas N2 would neither significantly affect the mole fraction nor its uncertainty value. These results clarified the importance of purity analysis on standard gas mixture preparation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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