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


Pearce, Christopher R., Cohen, Antony S. and Parkinson, Ian J. (2009) Quantitative separation of molybdenum and rhenium from geological materials for isotopic analysis by MC-ICP-MS. Geostandards and Geoanalytical Research, 33, (2), 219-229. (doi:10.1111/j.1751-908X.2009.00012.x).

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Description/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: Article
ISSNs: 0150-5505 (print)
1751-908X (electronic)
Keywords: molybdène, rhénium, chromatographie par échange d'ions, MC-ICP-MS, molybdenum, rhenium, ion exchange chromatography
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Q Science > Q Science (General)
Divisions: Faculty of Natural and Environmental Sciences > Ocean and Earth Science > Geochemistry
ePrint ID: 342512
Date Deposited: 07 Sep 2012 11:00
Last Modified: 27 Mar 2014 20:24
URI: http://eprints.soton.ac.uk/id/eprint/342512

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