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A Study on Trapping CO2 Using Molecular Sieve for 14C AMS Sample Preparation

  • Kyumin Choe (a1) (a2), Sujin Song (a1), Jang Hoon Lee (a1), Young Mi Song (a1), Jin Kang (a1), Myoung-ho Yun (a1) and Jong Chan Kim (a3)...

Abstract

At the Seoul National University accelerator mass spectrometry (AMS) laboratory, we are planning to develop an automated sample preparation system for higher throughput of radiocarbon dating. This system will consist of several sections, including a combustion line, CO2 trap, graphitization system, and so on. We usually collect CO2 by cryogenic trapping. However, since handling liquid nitrogen is expected to be rather difficult, we are interested in replacing the cryogenic method with the molecular sieve method for the collection of CO2. In this study, we compare the performance of the cryogenic trapping method and molecular sieve method. Zeolite 13X is used as a molecular sieve, and as test samples we use the oxalic acid standard (NIST SRM 4990C), high-purity graphite powder, and archaeological charcoals. The pMC values and the radiocarbon ages (BP) obtained from samples prepared by the above 2 methods are very similar. We especially focused on the memory effect of the molecular sieve, meaning the CO2 contamination from a previous sample, which can cause errors in age determination. To reduce this effect, we flowed He gas through a zeolite container for several minutes at a high temperature before the CO2 was introduced. By the adding this step, we have obtained more reliable results.

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Copyright

Corresponding author

Corresponding author. Email: kyuminchoe@snu.ac.kr.

References

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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(7):824–7.
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.
Hong, W, Park, JH, Kim, KJ, Woo, HJ, Kim, JK, Choi, HW, Kim, GD. 2010. Establishment of chemical preparation methods and development of an automated reduction system for AMS sample preparation at KIGAM. Radiocarbon 52(2–3):1277–87.
Kim, JC, Lee, CH, Kim, IC, Park, JH, Kang, J, Cheoun, MK, Kim, YD, Moon, CB. 2000. A new AMS facility in Korea. Nuclear Instruments and Methods in Physics Research B 172(1–4):13–7.
Lee, C, Kim, JC, Park, JH, Kim, IC, Kang, J, Cheoun, MK, Choi, SY, Kim, YD, Moon, CB. 2000. Progress in sample preparation system for the Seoul National University AMS facility. Nuclear Instruments and Methods in Physics Research B 172(1–4):454–7.
Oeschger, H, Alder, B, Loosli, H, Langway, CC Jr, Renaud, A. 1966. Radiocarbon dating of ice. Earth and Planetary Science Letters 1:4954.
Ruff, M. 2008. Radiocarbon measurement of micro-scale samples – a carbon dioxide inlet system for AMS , University of Bern.
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.
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Radiocarbon
  • ISSN: 0033-8222
  • EISSN: 1945-5755
  • URL: /core/journals/radiocarbon
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