Quantitative separation of molybdenum and rhenium from geological materials for isotopic determination by MC-ICP-MS

Pearce, Christopher; Cohen, Anthony and Parkinson, Ian (2009). Quantitative separation of molybdenum and rhenium from geological materials for isotopic determination by MC-ICP-MS. Geostandards and Geoanalytical Research, 33(2), pp. 219–229.

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DOI (Digital Object Identifier) Link:	http://dx.doi.org/doi:10.1111/j.1751-908X.2009.00012.x
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Abstract

We have developed a new chemical procedure for the quantitative separation of molybdenum (Mo) and rhenium (Re) from a wide variety of geological samples. A single pass anion exchange separation provided complete recovery of pure Mo and Re in a form that was ideal for subsequent isotope and abundance determination by multi-collector inductively coupled plasma-mass spectroscopy (MC-ICP-MS). An enriched ¹⁰⁰Mo-⁹⁷Mo solution, mixed with the sample before digestion, enabled natural mass-dependant isotopic fractionation of Mo to be determined with an external reproducibility of < 0.12‰ (δ⁹⁸Mo/⁹⁵Mo, 2s). Determination of the concentration of Mo and Re in the same sample was achieved by isotope dilution, with instrumental mass-fractionation of Re being corrected by the simultaneous measurement of the ¹⁹¹Ir/¹⁹³Ir ratio. We have applied the new procedure to a variety of samples, including seawater, basalt and organic-rich mudrock. The procedure is ideally suited to palaeoredox studies requiring the precise determination of the Mo isotope composition and the Re/Mo ratio from the same sample.

Item Type:	Journal Article
Copyright Holders:	2009 International Association of Geoanalysts, 2009 The Authors
ISSN:	1639-4488
Keywords:	molybdenum; rhenium; ion exchange chromatography; MC-ICP-MS
Academic Unit/Department:	Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre:	Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID:	25919
Depositing User:	Chris Pearce
Date Deposited:	06 Jan 2011 11:30
Last Modified:	23 Oct 2012 19:24
URI:	http://oro.open.ac.uk/id/eprint/25919

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