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An Isotope Dilution ICP-MS Method for the Determination of Mg/Ca and Sr/Ca Ratios in Calcium Carbonate

Fernandez, Diego P. and Gagnon, Alex C. and Adkins, Jess F. (2011) An Isotope Dilution ICP-MS Method for the Determination of Mg/Ca and Sr/Ca Ratios in Calcium Carbonate. Geostandards and Geoanalytical Research, 35 (1). pp. 23-37. ISSN 1639-4488. https://resolver.caltech.edu/CaltechAUTHORS:20110314-105334327

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Abstract

Mg/Ca and Sr/Ca ratios in calcium carbonate are important components of many palaeoclimate studies. We present an isotope dilution method relying on a single mixed spike containing ^(25)Mg, ^(43)Ca and ^(87)Sr. Dozens of samples per day, as small as 10 μg of carbonate, could be dissolved, spiked and run in an ICP-MS with a precision of 0.8% (2 RSD). Two instruments types, a sector field and a quadrupole ICP-MS, were compared. The best long term precision found was 0.4% (2 RSD), although this increased by up to a factor of two when samples of very different Mg or Sr content were run together in the same sequence. Long term averages for the two instruments concurred. No matrix effects were detected for a range of Ca concentrations between 0.2 and 2 mmol l^(-1). Accuracy, tested by measuring synthetic standard solutions, was 0.8% with some systematic trends. We demonstrate the strength of this isotope dilution method for (a) obtaining accurate results for sample sets that present a broad Mg and Sr range and (b) testing solid carbonates as candidate reference materials for interlaboratory consistency. Mg/Ca and Sr/Ca results for reference materials were in good agreement with values from the literature.


Item Type:Article
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URLURL TypeDescription
http://dx.doi.org/10.1111/j.1751-908X.2010.00031.x DOIUNSPECIFIED
http://onlinelibrary.wiley.com/doi/10.1111/j.1751-908X.2010.00031.x/abstractPublisherUNSPECIFIED
Additional Information:© 2010 The Authors. Geostandards and Geoanalytical Research © 2010 International Association of Geoanalysts. Received 05 Jan 09; Accepted 07 Aug 09. Article first published online: 15 Sep. 2010. This work was supported by the National Science Foundation, Grants OCE-0096373 and OCE-0502642, and the Comer Science and Education Foundation, Grant CM113. We acknowledge two anonymous reviewers for comments and suggestions than improved this manuscript.
Funders:
Funding AgencyGrant Number
NSFOCE-0096373
NSFOCE-0502642
Comer Science and Education FoundationCM113
Subject Keywords:carbonate; ICP-MS; quadrupole ICP-MS; sector field ICP-MS; isotope dilution; minor elements; carbonate; ICP-MS quadripolaire; ICP-MS a secteur magnetique; dilution isotopique; elements mineurs
Issue or Number:1
Record Number:CaltechAUTHORS:20110314-105334327
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20110314-105334327
Official Citation:Fernandez, D. P., Gagnon, A. C. and Adkins, J. F. (2011), An Isotope Dilution ICP-MS Method for the Determination of Mg/Ca and Sr/Ca Ratios in Calcium Carbonate. Geostandards and Geoanalytical Research, 35: 23–37. doi: 10.1111/j.1751-908X.2010.00031.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22853
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Mar 2011 21:52
Last Modified:03 Oct 2019 02:41

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