Quantitative Separation of Molybdenum and Rhenium from Geological Materials for Isotopic Determination by MC-ICP-MS

Christopher R. Pearce*, Anthony S. Cohen, Ian J. Parkinson

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

48 Citations (Scopus)

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 (100)Mo-(97)Mo 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 parts per thousand (delta(98)Mo/(95)Mo, 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 (191)Ir/(193)Ir 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.

Original languageEnglish
Pages (from-to)219-229
Number of pages11
JournalGeostandards and Geoanalytical Research
Volume33
Issue number2
DOIs
Publication statusPublished - Jun 2009

Keywords

  • SHALES
  • MC-ICP-MS
  • rhenium
  • chromatographie par Echange d'ions
  • ANOXIA
  • RE-OS
  • SIGNATURES
  • molybdene
  • ion exchange chromatography
  • IONIZATION MASS-SPECTROMETRY
  • molybdenum
  • BLACK-SEA
  • MARINE-SEDIMENTS
  • ELEMENTS
  • rhEnium
  • FRACTIONATION
  • PRECISE DETERMINATION

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