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    Is Classical Acid-Alkali-Acid Treatment Responsible for Contamination? An Alternative Proposition

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    Author
    Hatté, Christine
    Morvan, Jean
    Noury, Claude
    Paterne, Martine
    Issue Date
    2001-01-01
    
    Metadata
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    Citation
    Hatté, C., Morvan, J., Noury, C., & Paterne, M. (2001). Is classical acid-alkali-acid treatment responsible for contamination? An alternative proposition. Radiocarbon, 43(2A), 177-182.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    Description
    From the 17th International Radiocarbon Conference held in Jerusalem, Israel, June 18-23, 2000.
    URI
    http://hdl.handle.net/10150/654518
    DOI
    10.1017/S003382220003798X
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    It is well known that, during the widely used AAA pretreatment (de Vries and Barendsen 1954), alkali treatment is responsible for the incorporation of modern carbon due to the precipitation of atmospheric CO2 as carbonate. Until now, the last step of the experiment, consisting in acid treatment (most of the time with hydrochloric acid) was considered to be sufficient to eliminate all of lab contamination. But wood, peat and sediment present a complex molecular structure. During radiocarbon chemical treatments, functional groups still present in the molecules are likely to form ionic bonds with “modern” carbonates. These new chemical bonds resist a “classical” acid treatment and are responsible for rejuvenation. This short paper presents preliminary results for two common 14C cases: rejuvenation of a 0.4 pMC wood and of an Oxygen Isotope Stage 3 (OIS3) paleosol. For both cases, contamination due to incorporation of modern carbon during chemical treatment is evaluated and an alternative protocol is proposed.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S003382220003798X
    Scopus Count
    Collections
    Radiocarbon, Volume 43, Number 2A (2001

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