A reflection on Mg, Cd, Ca, Li and Si isotopic measurements and related reference materials

Carignan, Jean, Cardinal, Damien, Eisenhauer, Anton, Galy, Albert, Rehkämper, Mark, Wombacher, Frank and Vigier, Nathalie (2004) A reflection on Mg, Cd, Ca, Li and Si isotopic measurements and related reference materials Geostandards and Geoanalytical Research, 28 (1). pp. 139-148. DOI 10.1111/j.1751-908X.2004.tb01050.x.

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This contribution aims to report the reflections we had with the scientific community during two international workshops on reference materials for stable isotopes in Davos (2002) and Nice (2003). After evaluating the isotopic homogeneity of some existing reference materials, based on either certificates, literature data or specific inter-laboratory rounds, we confirm these as primary reference materials or propose new ones relative to which stable isotope compositions should be reported. We propose DSM-3 for Mg, NIST SRM 915a for Ca, L-SVEC for Li and NBS28 for Si. Cadmium does not yet have a well identified delta zero material, although three commercial mono-elemental Cd solutions have yielded the same isotopic composition relative to one another. In order to scale the linearity of any mass spectrometer, some secondary reference materials are also proposed: Cambridge-1 solution for Mg, the “Münster-Cd” and JEPPIM Cd solutions for Cd and the “Big Batch” silicate for Si. The team from Nancy propose to prepare a mixed spike solution for Li isotopes. Well-characterised natural samples such as ocean or continental waters, diatoms, sponges, rocks and minerals are needed to validate the entire analytical procedure, particularly to take into account the effect of sample mineralisation and of chemical manipulations for elemental separation prior to analysis.

Document Type: Article
Keywords: reference materials, stable isotopes, MC-ICP-MS, magnesium, calcium, cadmium, lithium, silicon
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
DOI etc.: 10.1111/j.1751-908X.2004.tb01050.x
ISSN: 1639-4488
Date Deposited: 02 Mar 2009 15:51
Last Modified: 21 Jul 2017 07:33
URI: http://eprints.uni-kiel.de/id/eprint/1550

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