Universität zu Köln

Wotte, Anja ORCID: 0000-0002-1875-8376, Wordell-Dietrich, Patrick ORCID: 0000-0002-2738-9090, Wacker, Lukas, Don, Axel and Rethemeyer, Janet (2017). (CO2)-C-14 processing using an improved and robust molecular sieve cartridge. Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms, 400. S. 65 - 74. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1872-9584

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Abstract

Radiocarbon (C-14) analysis on CO2 can provide valuable information on the carbon cycle as different carbon pools differ in their C-14 signature. While fresh, biogenic carbon shows atmospheric C-14 concentrations, fossil carbon is C-14 free. As shown in previous studies, CO2 can be collected for C-14 analysis using molecular sieve cartridges (MSC). These devices have previously been made of plastic and glass, which can easily be damaged during transport. We thus constructed a robust MSC suitable for field application under tough conditions or in remote areas, which is entirely made of stainless steel. The new MSC should also be tight over several months to allow long sampling campaigns and transport times, which was proven by a one year storage test. The reliability of the (CO2)-C-14 results obtained with the MSC was evaluated by detailed tests of different procedures to clean the molecular sieve (zeolite type 13X) and for the adsorption and desorption of CO2 from the zeolite using a vacuum rig. We show that the (CO2)-C-14 results are not affected by any contamination of modern or fossil origin, cross contamination from previous samples, and by carbon isotopic fractionation. In addition, we evaluated the direct CO2 transfer from the MSC into the automatic graphitization equipment AGE with the subsequent C-14 AMS analysis as graphite. This semi-automatic approach can be fully automated in the future, which would allow a high sample throughput. We obtained very promising, low blank values between 0.0018 and 0.0028 (FC)-C-14 (equivalent to 50,800 and 47,200 yrs BP), which are within the analytical background and lower than results obtained in previous studies. (C) 2017 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wotte, Anja UNSPECIFIED orcid.org/0000-0002-1875-8376 UNSPECIFIED Wordell-Dietrich, Patrick UNSPECIFIED orcid.org/0000-0002-2738-9090 UNSPECIFIED Wacker, Lukas UNSPECIFIED UNSPECIFIED UNSPECIFIED Don, Axel UNSPECIFIED UNSPECIFIED UNSPECIFIED Rethemeyer, Janet UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-230164
DOI:	10.1016/j.nimb.2017.04.019
Journal or Publication Title:	Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms
Volume:	400
Page Range:	S. 65 - 74
Date:	2017
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1872-9584
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences > Institute of Geology and Mineralog
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PASSIVE SAMPLING METHOD; CARBON-DIOXIDE; RADIOCARBON ANALYSIS; SOIL RESPIRATION; ISOTOPE C-14; CO2; ADSORPTION; METHANE; FOREST; RATES Multiple languages Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23016