Batch processing of tree-ring samples for radiocarbon analysis

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We here present a comparison of methods for the pretreatment of a batch of tree rings for high-precision measurement of radiocarbon at the Aarhus AMS Centre (AARAMS), Aarhus University, Denmark. The aim was to develop an efficient and high-Throughput method able to pretreat ca. 50 samples at a time. We tested two methods for extracting α-cellulose from wood to find the most optimal for our use. One method used acetic acid, the other used HCl acid for the delignification. The testing was conducted on background 14C samples, in order to assess the effect of the different pretreatment methods on low-Activity samples. Furthermore, the extracted wood and cellulose fractions were analyzed using Fourier transform infrared (FTIR) spectroscopy, which showed a successful extraction of α-cellulose from the samples. Cellulose samples were pretreated at AARAMS, and the graphitization and radiocarbon analysis of these samples were done at both AARAMS and the radiocarbon dating laboratory at Lund University to compare the graphitization and AMS machine performance. No significant offset was found between the two sets of measurements. Based on these tests, the pretreatment of tree rings for high-precision radiocarbon analysis at AARAMS will henceforth use HCI for the delignification.

OriginalsprogEngelsk
TidsskriftRadiocarbon
Vol/bind63
Nummer1
Sider (fra-til)77-89
Antal sider13
ISSN0033-8222
DOI
StatusUdgivet - feb. 2021

Bibliografisk note

Funding Information:
We acknowledge financial support from the Villum Foundation (VKR023114 and VKR010116). Funding for the Stellar Astrophysics Centre is provided by the Danish National Research Foundation (Grant agreement No.: DNRF106). N.J.L. thanks the Leverhulme Trust (RPG-2014-327) for research support.

Publisher Copyright:
© 2020 by the Arizona Board of Regents on behalf of the University of Arizona.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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