Hostname: page-component-cc8bf7c57-7lvjp Total loading time: 0 Render date: 2024-12-11T22:56:55.284Z Has data issue: false hasContentIssue false
  • English
  • Français

Molecular Sieves in 14CO2 Sampling and Handling

Published online by Cambridge University Press:  09 February 2016

V Palonen  and
M Oinonen
V Palonen*
Affiliation:
Department of Physics, University of Helsinki, P.O. Box 43, FI-00014, Finland
M Oinonen
Affiliation:
Laboratory of Chronology, Finnish Museum of Natural History LUOMUS, P.O. Box 64, University of Helsinki, Finland
*
Corresponding author. Email: [email protected].
Get access Rights & Permissions [Opens in a new window]

Abstract

Molecular sieves are a promising way to sample and manipulate gaseous samples for radiocarbon analyses. Molecular sieve material can adsorb CO2 selectively, enabling sampling of CO2 from large air volumes in a small amount of adsorbent. The sieve material can be regenerated via heating and reused without removing the sieve material from its container. This results in ease of use and reduced risks of atmospheric contamination. Because sieve container volume is small and can be filled with synthetic air or nitrogen, it does not introduce underpressure to the system under study. Hence, sieves are suitable for many different experimental setups, from collection of CO2 from small soil chambers to atmospheric CO2 collection. The most common sieve material in use for sampling CO2 is the 13X zeolite. For environmental measurements starting this year, we have studied the properties of 13X zeolites in more detail. For reliable 14CO2 sampling, there are several caveats that should and can be avoided. In this contribution, we discuss these caveats and solutions to optimize the molecular sieve sampling process.

Type
Articles
Information
Radiocarbon , Volume 55 , Issue 2: Proceedings of the 21st International Radiocarbon Conference (Part 1 of 2) , 2013 , pp. 416 - 420
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bayer, JE, Williams, PM, Druffel, ERM. 1992. Recovery of submilligram quantities of carbon dioxide from gas streams by molecular sieve for subsequent determination of isotopic (13C and 14C) natural abundances. Analytical Chemistry 64(7):824–7.Google Scholar
Garnett, MH, Murray, C. 2013. Processing of CO2 samples collected using zeolite molecular sieve for 14C analysis at the NERC Radiocarbon Facility. Radiocarbon, these proceedings. doi: 10.2458/azu_js_rc.55.16058.Google Scholar
Hämäläinen, K, Fritze, H, Jungner, H, Karhu, K, Oinonen, M, Sonninen, E, Spetz, P, Tuomi, M, Vanhala, P, Liski, J. 2010. Molecular sieve sampling of CO2 from decomposition of soil organic matter for AMS radiocarbon measurements. Nuclear Instruments and Methods in Physics Research B 268(7–8):1067–9.Google Scholar
Hardie, SML, Garnett, MH, Fallick, AE, Rowland, AP, Ostle, NJ. 2005. Carbon dioxide capture using a zeolite molecular sieve sampling system for isotopic studies (13C and 14C) of respiration. Radiocarbon 47(3):441–51.CrossRefGoogle Scholar
Palonen, V, Pesonen, A, Herranen, T, Tikkanen, P, Oinonen, M. 2013. HASE - The Helsinki adaptive sample preparation line. Nuclear Instruments and Methods in Physics Research B 294:182–4.Google Scholar
Ruthven, DM. 1984. Principles of Adsorption and Adsorption Processes. New York: John Wiley & Sons.Google Scholar
Yang, RT. 1997. Gas Separation by Adsorption Processes. London: Imperial College Press.Google Scholar
Yang, RT. 2003. Adsorbents: Fundamentals and Applications. Hoboken: John Wiley & Sons.Google Scholar