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Alternative Methods for Cellulose Preparation for AMS Measurement

Published online by Cambridge University Press:  18 July 2016

Mojmír Němec ,
Lukas Wacker ,
Irka Hajdas  and
Heinz Gäggeler
Mojmír Němec*
Affiliation:
Department for Chemistry and Biochemistry, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland Laboratory of Ion Beam Physics, HPK, Schafmattstrasse 20, CH-8093 Zürich, Switzerland Department of Nuclear Chemistry, Czech Technical University in Prague, Brehova 7, 115 19 Prague 1, Czech Republic
Lukas Wacker
Affiliation:
Laboratory of Ion Beam Physics, HPK, Schafmattstrasse 20, CH-8093 Zürich, Switzerland
Irka Hajdas
Affiliation:
Laboratory of Ion Beam Physics, HPK, Schafmattstrasse 20, CH-8093 Zürich, Switzerland
Heinz Gäggeler
Affiliation:
Department for Chemistry and Biochemistry, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
*
Corresponding author. Email: mojmir.nemec@fjfi.cvut.cz
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Abstract

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The main methods applied to clean plant material for radiocarbon dating are not compound-specific and generally remove only the easily exchangeable components by an acid-base-acid sequence and additional optional steps like Soxhlet extraction to remove resins and oxidative bleaching with NaClO2. The products are normally clean enough for standard 14C measurement, but in some cases it is desirable to have pure cellulose, which remains unchanged and immobile over longer time ranges, better representing the original plant material. In this work, 2 more compound-specific but still simple methods were tested to separate the cellulose from wood. The viscose method is based on the xanthification process used in the textile industry, where the alkali-cellulose with CS2 forms a soluble cellulose xanthate, which is then extracted and cellulose is recovered. The second procedure is based on the wood/cellulose dissolution in ionic liquid 1-butyl-3-methylimidazolium chloride [BMIM]Cl, when the dissolved cellulose could be precipitated again by simply adding a water-acetone mixture. This process was recently reported, but still not used in sample preparation procedures for 14C dating.

Type
Sample Preparation
Information
Radiocarbon , Volume 52 , Issue 3: 20th Int. Radiocarbon Conference Proceedings , 2010 , pp. 1358 - 1370
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

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