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Issue 4, 2003
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Purification of Mg from low-Mg biogenic carbonates for isotope ratio determination using multiple collector ICP-MS

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Abstract

A technique for separation of Mg, with 100% yield from low-Mg biogenic carbonates has been developed suitable for high precision analysis of Mg isotopes by multiple-collector inductively coupled plasma mass spectrometry. Two separate stages of ion-exchange chromatography were carried out using cation exchange resin, AG50W-X12 with a Mg recovery >99.9%. The repeatability of the Mg isotope ratio measurement using this technique including chemistry and mass spectrometry is ±0.14‰ on δ26Mg and ±0.09‰ on δ25Mg at 95% confidence. This was demonstrated using a synthetic solution (Na∶Mg∶Ca∶Sr = 2∶1∶100∶1 in weight) over a period of six months. The robustness of the technique was further assessed by replicate analyses of three natural samples, seawater, foraminifera and dolomite. A total variation over 4.5‰ on δ26Mg was observed and the Mg isotope composition of seawater was 2.59 ± 0.14‰ on δ26Mg and 1.33 ± 0.09‰ on δ25Mg which were the highest isotope ratios among the samples measured.

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Publication details

The article was received on 07 Nov 2002, accepted on 20 Feb 2003 and first published on 12 Mar 2003


Article type: Paper
DOI: 10.1039/B210977H
Citation: J. Anal. At. Spectrom., 2003,18, 296-301
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    Purification of Mg from low-Mg biogenic carbonates for isotope ratio determination using multiple collector ICP-MS

    V. T.-C. Chang, A. Makishima, N. S. Belshaw and R. K. O'Nions, J. Anal. At. Spectrom., 2003, 18, 296
    DOI: 10.1039/B210977H

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