High precision measurement of titanium isotope ratios by plasma source mass spectrometry

X. K. Zhu, A. Makishima, Y. Guo, N. S. Belshaw, R. K. O'Nions

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

A method using multiple-collector inductively coupled plasma source mass spectrometry for the precise measurement of Ti isotope composition in natural materials has been developed. Instrumental mass discrimination is corrected using a "standard-sample bracketing" approach by expressing the isotope ratios of samples relative to those of the bracketing standard. Variations in 47Ti/46Ti, 48Ti/46Ti, 49Ti/46Ti and 50Ti/46Ti ratios of samples are expressed in ε units which are deviations in parts per 104 from the same isotope ratios of the reference material. The long-term repeatability at the 2 standard deviation level is 0.4, 0.6, 0.7 and 0.8 ε units in terms of 47Ti/46Ti, 48Ti/46Ti, 49Ti/46Ti and 50Ti/46Ti ratio measurements, respectively. The technique reported here makes it possible for the first time that both mass-dependent fractionation and isotope anomalies of Ti isotopes in natural materials can be measured to high precision.

Original languageEnglish
Pages (from-to)21-29
Number of pages9
JournalInternational Journal of Mass Spectrometry
Volume220
Issue number1
DOIs
Publication statusPublished - Sep 15 2002

Keywords

  • Matrix effects
  • Plasma source mass spectrometry
  • Stable isotopes
  • Titanium isotopes
  • Transition metal

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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