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Direct Absorption Method and Liquid Scintillation Counting for Radiocarbon Measurements in Organic Carbon from Sediments

Published online by Cambridge University Press:  18 July 2016

Ionut Faurescu*
Affiliation:
Institute for Cryogenics and Isotopic Technologies, Rm. Valcea, Romania
Carmen Varlam
Affiliation:
Institute for Cryogenics and Isotopic Technologies, Rm. Valcea, Romania
Ioan Stefanescu
Affiliation:
Institute for Cryogenics and Isotopic Technologies, Rm. Valcea, Romania
Stela Cuna
Affiliation:
Institute for Isotopic and Molecular Technologies, Cluj-Napoca, Romania
Irina Vagner
Affiliation:
Institute for Cryogenics and Isotopic Technologies, Rm. Valcea, Romania
Denisa Faurescu
Affiliation:
Institute for Cryogenics and Isotopic Technologies, Rm. Valcea, Romania
Diana Bogdan
Affiliation:
Institute for Cryogenics and Isotopic Technologies, Rm. Valcea, Romania
*
Corresponding author. Email: [email protected]
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Abstract

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In this paper, we investigate a procedure for radiocarbon determination in forest soil and slurry from lake sediments. The total carbon in these samples can be both inorganic and organic. Inorganic carbon can be analyzed in a straightforward manner using the direct absorption method by sample acidification and CO2 capture. For organic carbon, we investigate a hybrid method using the wet-oxidation of organic carbon followed by direct absorption. To evaluate the wet-oxidation processes with potassium dichromate (K2Cr2O7) and potassium permanganate (KMnO4), we performed several experiments using different quantities of soil and sediments in order to establish the quantity of CO2 for each type of sample. The 2 methods offer comparable results for 14C-specific activity (about 0.234 ± 0.024 Bq/g C), values that are expected for these kinds of samples. We also investigated the possibility of isotopic fractionation occurring during CO2 production from raw material by measuring δ13C levels from samples and obtained CO2.

Type
Methods, Applications, and Developments
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

References

Hemmila, I, Stahleberg, T, Kaihola, L. 1994. Bioanalytical Applications of Labelling Technologies. Turku: Wallac Oy. p 6081.Google Scholar
IAEA (International Atomic Energy Agency). 2004. Management of waste containing tritium and carbon-14. Technical Reports Series nr 421. Vienna: IAEA. p 537.Google Scholar
Magny, J, Baur, J. 1962. Pour Comprendre les Analyses de Terre. Toulouse: Centre d'Etude et de Modernisation agricoles Purpan. p 41–2.Google Scholar
Mathur, SP. 1991. Some comments on loss or accumulation of soil organic matter and their effects on soil quality. In: Mathur, SP, Wang, C, editors. Soil Quality in the Canadian Context. Technical Bulletin 1991–1E. Ottawa: Agriculture Canada Research Branch. p 50–3.Google Scholar
Schumacher, BA. 2002. Methods for the determination of total organic carbon (TOC) in soils and sediments. NCEA-C- 1282, EMASC-001. April 2002. Las Vegas: United States Environmental Protection Agency.Google Scholar
UNSCEAR (United Nations Scientific Committee on the Effects of Atomic Radiation). 2000. United Nations. Sources and Effects of Ionizing Radiation Report to the General Assembly, with Scientific Annexes. New York: United Nations.Google Scholar
Varlam, C, Stefanescu, I, Varlam, M, Popescu, I, Faurescu, I. 2007. Applying the direct absorption method and LSC for 14C concentration in aqueous samples. Radiocarbon 49(2):281–9.CrossRefGoogle Scholar
Vita-Finzi, C, Leaney, F. 2006. The direct absorption method of 14C assay—historical perspective and future potential. Quaternary Science Reviews 25(9–10):1073–9.CrossRefGoogle Scholar