Abstract
A high-precision analytical system to observe the variations in the amount fractions of atmospheric oxygen with a very small uncertainty was developed. The system comprises a magneto-pneumatic oxygen analyzer and three automatic pressure controllers. The drift of the analyzer’s signal intensity can be reduced when the amount fractions of oxygen in the sample and reference gases are similar because the temperature coefficient of the analyzer linearly depends on the difference between these amount fractions. The repeatability of oxygen determination and the long-term stability of the system were tested to assess the applicability of the analyzer to field-based measurements for continuous atmospheric observations. The standard deviation of the average for 10-min measurements in the 5-day long-term stability test was 0.7 μmol mol-1 after a temperature correction. This indicates that the system can continuously measure the amount fractions of oxygen in the atmosphere for a few days without interruption for any calibration and/or compensation for the signal drift.
Similar content being viewed by others
References
R. F. Keeling, J. Atmos. Chem., 1988, 7, 153.
R. F. Keeling and S. R. Shertz, Nature, 1992, 358, 723.
R. F. Keeling, M. L. Bender, and P. P. Tans, Global Biogeochem. Cycles, 1993, 7, 37.
R. F. Keeling, S. C. Piper, and M. Heimann, Nature, 1996, 381, 218.
M. Battle, M. L. Bender, P. P. Tans, J. W. C. White, J. T. Ellis, T. Conway, and R. J. Francey, Science, 2000, 287, 2467.
18th WMO/IAEA Meeting on Carbon Dioxide, Other Greenhouse Gases and Related Tracers Measurement Techniques (GGMT-2015), GAW Report No. 229, 2015.
A. C. Manning, R. K. Keeling, and J. P. Severinghaus, Global Biogeochem. Cycles, 1999, 13, 1107.
Y. Tohjima, J. Geophys. Res., 2000, 105(D11), 14575.
M. L. Bender, P. P. Tans, J. T. Ellis, J. Orchardo, and K. Habfast, Geochim. Cosmochim. Acta, 1994, 58, 4751.
B. B. Stephens, R. Keeling, and W. J. Paplawsky, Tellus, 2003, 55B, 857.
B. B. Stephens, P. S. Bakwin, P. P. Tans, R. M. Teclaw, and D. D. Baumann, J. Atmos. Oceanic Tech., 2007, 24, 82.
D. Goto, S. Morimoto, S. Ishidoya, A. Ogi, S. Aoki, and T. Nakazawa, J. Meteorol. Soc. Japan, 2013, 91, 179.
T. Shimosaka, Bunseki Kagaku, 2013, 62, 1117.
R. Kocache, J. Phys. E, 1986, 19, 401.
P. T. Merilainen, Int. J. Clin. Monit. Comput., 1988, 5, 187.
S. Barlod, F. Burkart, and E. Sowton, Brit. Heart J., 1966, 28, 776.
A. Kania, in Proceedings of 57th Analysis Division Symposium 2012, Anaheim, California, USA (https://www.automation.siemens.com/w1/efiles/automation-technology/pa/techn_publications/Magneto-pneumatic_Oxygen_Analyzer.pdf).
ISO 6142-1, “Gas Analysis—Preparation of Calibration Gas Mixtures—Part 1: Gravimetric Method for Class I. Mixtures”, 2015, International Organization for Standardization, Switzerland.
Acknowledgments
This study was partly supported by a grant for the Global Environmental Research Coordination System, from the Ministry of the Environment, Japan.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Aoki, N., Shimosaka, T. Development of an Analytical System Based on a Magneto-pneumatic Oxygen Analyzer for Atmospheric Oxygen Determination. ANAL. SCI. 34, 487–493 (2018). https://doi.org/10.2116/analsci.17P380
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.2116/analsci.17P380