A new method for MC-ICPMS measurement of titanium isotopic composition: Identification of correlated isotope anomalies in meteorites

Junjun Zhang, Nicolas Dauphas, Andrew M. Davis, Ali Pourmand

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

A new protocol is presented for precise measurements of titanium isotopes in natural samples. Titanium was separated via ion-exchange and extraction chromatography in two stages. Tests on Ti standard solutions show that isobaric interferences from Ca, V, and Cr can be adequately corrected, as long as these elements are present at atomic ratios of Ca/Ti < 20, V/Ti < 2, and Cr/Ti < 0.1. Furthermore, Zr2+ and Mo2+ have no influences on Ti+ signals when atomic ratios of Zr/Ti < 0.002 and Mo/Ti < 0.04. Compared with these correction limits, the purified solutions have corresponding ratios several orders of magnitude lower, indicating that the chemical separation technique is effective. This newly developed method has been successfully applied to geostandards and a wide variety of bulk meteorites. Our results are in good agreement with the data from Trinquier et al. (Science, 2009, 324, 374-376)1 and reveal a linear correlation between isotope anomalies of two Ti nuclides in bulk meteorites. The correlation reflects incomplete mixing of the carrier phases for Ti isotope anomalies before bulk meteorite formation.

Original languageEnglish (US)
Pages (from-to)2197-2205
Number of pages9
JournalJournal of Analytical Atomic Spectrometry
Volume26
Issue number11
DOIs
StatePublished - Nov 1 2011

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

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