Jump to main content
Jump to site search

Issue 4, 2003
Previous Article Next Article

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

Author affiliations

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.

Back to tab navigation

Article information


Submitted
07 Nov 2002
Accepted
20 Feb 2003
First published
12 Mar 2003

J. Anal. At. Spectrom., 2003,18, 296-301
Article type
Paper

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

Social activity

Search articles by author

Spotlight

Advertisements