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    High-sensitivity measurements of strontium isotopes in polar ice

    Access Status
    Fulltext not available
    Authors
    Burton, Graeme
    Boutron, C.
    Rosman, Kevin
    Date
    2002
    Type
    Journal Article
    
    Metadata
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    Citation
    Burton, Graeme and Boutron, C. and Rosman, Kevin. 2002. High-sensitivity measurements of strontium isotopes in polar ice. Analytica Chimica Acta. 469 (2): pp. 225-233.
    Source Title
    Analytica Chimica Acta
    DOI
    10.1016/S0003-2670(02)00720-1
    ISSN
    00032670
    Faculty
    Department of Medical Imaging and Applied Physics
    School of Science
    Faculty of Science and Engineering
    School
    Department of Imaging and Applied Physics
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/502681/description#description

    Copyright © 2002 Elsevier Ltd. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/45247
    Collection
    • Curtin Research Publications
    Abstract

    Techniques have been developed to measure the isotopic composition and concentration of Sr at sub-nanogram per gram levels in polar snow and ice samples. A 84Sr spike was used to determine Sr concentrations on a single sample aliquot of a few millilitre. Microlitre scale columns of Sr-Spec resin were used to purify Sr samples. Thermal ionisation mass spectrometry (TIMS) was used to measure the Sr isotopic ratios. A single TIMS measurement of the Sr sample yielded both isotopic composition and concentration after deconvolution of spike and sample spectra. This allows isotopic variations in Sr to be used to identify source regions of crustal dust. Early Holocene and last glacial maximum ice core samples from both Antarctica and Greenland were analysed to demonstrate the applicability of the technique. Sr isotopes were analysed in 20 g sized samples of Antarctic early Holocene ice where the concentration was only 31 pg g−1. This represents an improvement of two orders of magnitude in sample consumption over previous studies allowing for a much higher time resolution in the analysis of polar ice cores.

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