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LEAD ISOTOPE ANALYSIS OF ARCHAEOLOGICAL METALS BY MULTIPLE-COLLECTOR INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY*

Authors

  • J. BAKER,

    1. Danish Lithosphere Centre, Øster Voldgade 10, 1350 Copenhagen, Denmark
    2. School of Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand
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  • S. STOS,

    1. Research Laboratory for Archaeology and the History of Art, University of Oxford, 6 Keble Road, Oxford OX1 3QJ, UK
    2. UniSdirect, University of Surrey, Guildford, Surrey GU2 7XH, UK
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  • T. WAIGHT

    Corresponding author
    1. Danish Lithosphere Centre, Øster Voldgade 10, 1350 Copenhagen, Denmark
    2. Geological Institute, Øster Voldgade 10, 1350 Copenhagen, Denmark
    • †To whom correspondence should be addressed: tel. +45 35 32 24 82; e-mail todw@geol.ku.dk

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Abstract

Lead isotope ratios in archaeological silver and copper were determined by MC–ICPMS using laser ablation and bulk dissolution without lead purification. Laser ablation results on high-lead metals and bulk solution analyses on all samples agree within error of TIMS data, suggesting that problems from isobaric interferences and/or mass bias variations due to the presence of matrix elements are insignificant. Inaccurate laser ablation analyses on low-lead copper reflect erroneous mass bias corrections from use of a non-matrix matched standard. However, in most cases, silver and copper are analysable for lead isotopes by bulk dissolution or laser ablation MC–ICPMS with simplified sample preparation.

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