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Isotopic Fractionation of NBS Oxalic 14C Standard and Its Effect On Calculated Age of Materials

Published online by Cambridge University Press:  18 July 2016

Victor A Nehmi
Victor A Nehmi*
Affiliation:
Centro de Pesquisas Geocronológicas, Instituto de Geociências, Universidade de São Paulo, 05508 São Paulo, Brazil
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Abstract

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There is much controversy about the significance to radiocarbon dating of isotopic fractionation during the oxidation to CO2 of NBS oxalic acid, the carbon-14 dating standard. To check the effect of fractionation, 30 routine potassium permanganate oxidations of oxalic acid were performed. The isotopic composition of resulting CO2 was determined mass-spectrometrically. δ13C results ranged between —17.7 and —21.2, with an average of —18.9‰ wrt PDB. The effect of not applying an isotopic fractionation correction to NBS oxalic acid when performing age calculations is evaluated.

Type
Techniques
Information
Radiocarbon , Volume 22 , Issue 2 , 1980 , pp. 501 - 504
Copyright
Copyright © The American Journal of Science 

References

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