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

Veronica T.C. Chang, Akio Makishima, Nick S. Belshaw, R. Keith O'Nions

Research output: Contribution to journalArticle

120 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)296-301
Number of pages6
JournalJournal of analytical atomic spectrometry
Volume18
Issue number4
DOIs
Publication statusPublished - Dec 1 2003

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

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