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Processing of CO2 Samples Collected Using Zeolite Molecular Sieve for 14C Analysis at the NERC Radiocarbon Facility (East Kilbride, UK)

Published online by Cambridge University Press:  09 February 2016

M H Garnett  and
C Murray
M H Garnett*
Affiliation:
NERC Radiocarbon Facility, Rankine Avenue, East Kilbride G75 OQF, United Kingdom
C Murray
Affiliation:
NERC Radiocarbon Facility, Rankine Avenue, East Kilbride G75 OQF, United Kingdom
*
1Corresponding author. Email: [email protected].
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Abstract

Cartridges containing a zeolite molecular sieve are used for the field collection of CO2 from a variety of environments (e.g. atmosphere, soil respiration, evasion from surface waters) for accelerator mass spectrometry (AMS) radiocarbon analysis by the NERC Radiocarbon Facility. Previously, sample CO2 was recovered from the sieves by heating under vacuum prior to cryogenic purification and graphitization. An additional heating and evacuation stage was used to prepare the cartridge for the next sample. We have recently developed an alternative method using heating and purging with nitrogen gas to remove sample CO2 from the molecular sieve. An infrared gas analyzer (IRGA) is used to continuously monitor CO2 content in the purge gas. The preparation of the molecular sieve cartridge for the next use is performed simultaneously and the IRGA reading is used to verify that all sample CO2 has been removed from the sieve, ensuring insignificant carryover of CO2 into the next sample. We present the results of a suite of standards of distinctly different 14C and stable-carbon isotope composition, which we used to confirm the reliability of the new procedure. The new method has considerably reduced the time required to process a single sample from at least 2 hr to less than 40 min, and reduced the minimum sample size by 50%.

Type
Articles
Information
Radiocarbon , Volume 55 , Issue 2: Proceedings of the 21st International Radiocarbon Conference (Part 1 of 2) , 2013 , pp. 410 - 415
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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References

Bauer, 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 64:824–7.CrossRefGoogle Scholar
Billett, MF, Garnett, MH, Hardie, SML. 2006. A direct method to measure 14CO2 lost by evasion from surface waters. Radiocarbon 48(1):61–8.CrossRefGoogle Scholar
Billett, MF, Dinsmore, KJ, Smart, RP, Garnett, MH, Holden, J, Chapman, P, Baird, AJ, Grayson, R, Stott, AW. 2012. Variable source and age of different forms of carbon released from natural peatland pipes. Journal of Geophysical Research 117:G02003, doi:02010.01029/02011JG001807.CrossRefGoogle Scholar
Boaretto, E, Bryant, C, Carmi, I, Cook, G, Gulliksen, S, Harkness, D, Heinemeier, J, McClure, J, McGee, E, Naysmith, P, Possnert, G, Scott, M, van der Plicht, H, Van Strydonck, M. 2002. Summary findings of the fourth international radiocarbon intercomparison (FIRI) (1998–2001). Journal of Quaternary Science 17(7):633–7.CrossRefGoogle Scholar
Bol, RA, Harkness, DD. 1995. The use of zeolite molecular sieves for trapping low concentrations of CO2 from environmental atmospheres. Radiocarbon 37(2):643–47.CrossRefGoogle Scholar
Garnett, MH, Hardie, SML. 2009. Isotope (14C and 13C) analysis of deep peat CO2 using a passive sampling technique. Soil Biology and Biochemistry 41(12):2477–83.CrossRefGoogle Scholar
Garnett, MH, Hartley, IP. 2010. A passive sampling method for radiocarbon analysis of atmospheric CO2 using molecular sieve. Atmospheric Environment 44(7):877–83.CrossRefGoogle Scholar
Garnett, MH, Hartley, IP, Hopkins, DW, Sommerkorn, M, Wookey, PA. 2009. A passive sampling method for radiocarbon analysis of soil respiration using molecular sieve. Soil Biology and Biochemistry 41(7):1450–6.CrossRefGoogle Scholar
Godwin, H, Willis, EH. 1964. Cambridge University natural radiocarbon measurements VI. Radiocarbon 6:116–37.CrossRefGoogle Scholar
Gulliksen, S, Scott, M. 1995. Report of the TIRI workshop, Saturday 13 August 1994. Radiocarbon 37(2):820–1.CrossRefGoogle 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
Hardie, SML, Garnett, MH, Fallick, AE, Ostle, NJ, Rowland, AP. 2009. Bomb-14C analysis of ecosystem respiration reveals that peatland vegetation facilitates release of old carbon. Geoderma 153(3–4):393–401.CrossRefGoogle Scholar
Hartley, IP, Garnett, MH, Sommerkorn, M, Hopkins, DW, Fletcher, BJ, Sloan, VL, Phoenix, GK, Wookey, PA. 2012. A potential loss of carbon associated with greater plant growth in the European Arctic. Nature Climate Change 2:875–9.CrossRefGoogle Scholar
Slota, PJ Jr, Jull, AJT, Linick, TW, Toolin, LJ. 1987. Preparation of small samples for 14C accelerator targets by catalytic reduction of CO. Radiocarbon 29(2):303–6.CrossRefGoogle Scholar
Stuiver, M, Polach, HA. 1977. Discussion: reporting of 14C data. Radiocarbon 19(3):355–63.CrossRefGoogle Scholar
Wacker, L, Nemec, M, Bourquin, J. 2010. A revolutionary graphitisation system: fully automated, compact and simple. Nuclear Instruments and Methods in Physics Research B 268(7–8):931–4.CrossRefGoogle Scholar