Articles | Volume 12, issue 5
https://doi.org/10.5194/amt-12-2631-2019
https://doi.org/10.5194/amt-12-2631-2019
Research article
 | 
07 May 2019
Research article |  | 07 May 2019

Preparation of primary standard mixtures for atmospheric oxygen measurements with less than 1 µmol mol−1 uncertainty for oxygen molar fractions

Nobuyuki Aoki, Shigeyuki Ishidoya, Nobuhiro Matsumoto, Takuro Watanabe, Takuya Shimosaka, and Shohei Murayama

Viewed

Total article views: 2,425 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
1,593 763 69 2,425 76 77
  • HTML: 1,593
  • PDF: 763
  • XML: 69
  • Total: 2,425
  • BibTeX: 76
  • EndNote: 77
Views and downloads (calculated since 26 Jun 2018)
Cumulative views and downloads (calculated since 26 Jun 2018)

Viewed (geographical distribution)

Total article views: 2,425 (including HTML, PDF, and XML) Thereof 2,253 with geography defined and 172 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Latest update: 29 Jun 2024
Short summary
Observation of atmospheric O2 requires highly precise standard gas mixtures with uncertainty of less than 1 ppm for the O2 mole fraction or 5 per meg for O2 / N2. The uncertainty had not been achieved due unknown uncertainty factors in mass determination of the filled source gases. We first developed the primary standard mixtures with 1 ppm for the O2 mole fraction or 5 per meg by identifying and reducing the unknown uncertainty factors.