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01583 am a22001453u 4500 |
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342512 |
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|a Pearce, Christopher R.
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|a Cohen, Antony S.
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|a Parkinson, Ian J.
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|a Quantitative separation of molybdenum and rhenium from geological materials for isotopic analysis by MC-ICP-MS
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|c 2009-06.
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|u https://eprints.soton.ac.uk/342512/1/Pearce_et_al_%25282009%2529.pdf
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|a 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‰ (?98Mo/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
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