Articles | Volume 15, issue 20
https://doi.org/10.5194/amt-15-5969-2022
https://doi.org/10.5194/amt-15-5969-2022
Research article
 | 
20 Oct 2022
Research article |  | 20 Oct 2022

Influence of CO2 adsorption on cylinders and fractionation of CO2 and air during the preparation of a standard mixture

Nobuyuki Aoki, Shigeyuki Ishidoya, Shohei Murayama, and Nobuhiro Matsumoto

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Short summary
The CO2 concentration in a cylinder is affected by carbon dioxide (CO2) adsorption to a cylinder’s internal surface and fractionation of CO2 and air in the preparation of standard mixtures. We demonstrate that the effects make the CO2 molar fractions deviate in standard mixtures prepared by diluting pure CO2 with air three times. This means that CO2 standard gases are difficult to gravimetrically prepare through multistep dilution.