Determination of physical adsorption loss of primary standard gas mixtures in cylinders using cylinder-to-cylinder division

Primary standard gas mixtures (PSMs) are typically prepared in cylinders and the amount-of-substance fractions are determined by purity analysis and gravimetric method. However, the actual amount-of-substance fraction can be different from the gravimetrically determined value due to adsorption loss...

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Bibliographic Details
Published in:Metrologia 2017-12, Vol.54 (6), p.L26-L33
Main Authors: Lee, Sangil, Kim, Mi Eon, Oh, Sang Hyub, Kim, Jin Seog
Format: Article
Language:English
Subjects:
Adsorption
cylinder
Cylinders
equal pressure division
Fractions
Gas mixtures
Gases
Gravimetric analysis
physical adsorption
primary standard gas mixture
Surface chemistry
Uncertainty
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Summary:Primary standard gas mixtures (PSMs) are typically prepared in cylinders and the amount-of-substance fractions are determined by purity analysis and gravimetric method. However, the actual amount-of-substance fraction can be different from the gravimetrically determined value due to adsorption loss onto the internal surface of cylinders. The resulted difference due to the adsorption loss can be larger than the PSM uncertainty. In this study, the cylinder-to-cylinder division method is proposed to evaluate any potential physical adsorption loss onto the internal surface of cylinders. A method for estimating the amount of adsorption loss, the corrected amount-of-substance fraction and its uncertainty due to the adsorption loss is described.
ISSN:0026-1394
1681-7575
DOI:10.1088/1681-7575/aa87b8