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    The Influence of Pretreatment on Humic Acid Yield and 14C Age of Carex Peat

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    Author
    Cook, G. T.
    Dugmore, A. J.
    Shore, J. S.
    Issue Date
    1998-01-01
    Keywords
    time factor
    Flokadalur Iceland
    Iceland
    accuracy
    mires
    bogs
    organic acids
    humic acids
    isotope ratios
    Holocene
    igneous rocks
    pyroclastics
    volcanic rocks
    organic compounds
    Europe
    Western Europe
    peat
    sample preparation
    sediments
    Cenozoic
    Quaternary
    methods
    C 14
    carbon
    dates
    isotopes
    radioactive isotopes
    C 13 C 12
    stable isotopes
    absolute age
    geochemistry
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    Citation
    Cook, G. T., Dugmore, A. J., & Shore, J. S. (1998). The influence of pretreatment on humic acid yield and 14C age of Carex peat. Radiocarbon, 40(1), 21-27.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    Description
    From the 16th International Radiocarbon Conference held in Gronigen, Netherlands, June 16-20, 1997.
    URI
    http://hdl.handle.net/10150/653761
    DOI
    10.1017/S0033822200017835
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    The object of the study was to assess the effects of a range of pretreatment/extraction schemes on the yields of humic acid and humin obtained from peat and the subsequent radiocarbon ages. We analyzed peat from Flokadalur in northern Iceland, collecting material from a profile containing seven visible tephra horizons in the upper 3 m, whose form and extent indicated little disturbance to the section over the last 4000 yr. The results of a range of pretreatments demonstrated that time rather than the strength of alkali is the more important factor governing the extraction of humic acid. An increase in alkali molarity did not correspond to any systematic increase in yield, whereas an increase in time did, implying that the extraction is kinetically controlled. We found no evidence of variability in 14C age due to pretreatment scheme or between different geochemical fractions of the peat. Further implications from this study are that bog stability and ecological simplicity produce a favorable environment for 14C dating.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200017835
    Scopus Count
    Collections
    Radiocarbon, Volume 40, Number 1 (1998)

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