Pearce, Christopher; Cohen, Anthony and Parkinson, Ian
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|DOI (Digital Object Identifier) Link:||http://dx.doi.org/10.1111/j.1751-908X.2009.00012.x|
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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|
|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)|
|Depositing User:||Chris Pearce|
|Date Deposited:||06 Jan 2011 11:30|
|Last Modified:||19 Jun 2014 21:58|
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