Precise determination of Cr, Mn, Fe, Co and Ni concentration by an isotope dilution-internal standardization method employing high resolution MC-ICP-MS

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Abstract

A new determination method for Cr, Mn, Fe, Co and Ni in silicate samples by an isotope dilution-internal standardization method (ID-IS)-high resolution (HR)-MC-ICP-MS has been developed. A silicate sample is dissolved into solution, and a Cr-spike solution is added into an aliquot of the sample solution. Then the solution is introduced into HR-MC-ICP-MS without chemical separation. Concentration of Cr is determined by ID, and those of Mn, Fe, Co and Ni are by ID-IS. Matrix effects were examined in detail, and negligible down to a dilution factor (DF; the weight of the sample solution over that of the sample in the solution) of ~3000 for basalt, and ~104 for peridotite and chondrite within an error range of ±1%. ID-IS-HR-MC-ICP-MS showed intermediate precision of ~1% for basalt and chondrite, which is comparable to ID-TIMS for Cr, Fe and Ni, and >10 times better than HR-ICP-MS, suggesting that this method is suitable for precise Mn-Cr and Fe-Ni chronometers.

Original languageEnglish
Pages (from-to)82-86
Number of pages5
JournalChemical Geology
Volume274
Issue number1-2
DOIs
Publication statusPublished - Jun 1 2010

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Keywords

  • Cr, Mn, Fe, Co, and Ni determination
  • High resolution MC-ICP-MS
  • Internal standardization
  • Isotope dilution

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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