Precise determination of mass-dependent variations in the isotopic composition of molybdenum using MC-ICPMS

A. D. Anbar, K. A. Knab, J. Barling

Research output: Contribution to journalArticle

132 Scopus citations

Abstract

We present an analytical approach for the precise determination of mass-dependent differences in the isotopic composition of Mo between samples and reference standards using multiple-collector magnetic sector inductively coupled plasma mass spectrometry (MC-ICPMS). Either Zr or Ru "element spikes" are employed to correct for instrumental mass bias. Differences in 95Mo/97Mo can be determined to a precision of ±0.2‰ (±2σ) using 1-10 μg of Mo. Similar precision is possible for other ratios after correction for isobaric interferences from either spike element. This approach facilitates study of mass-dependent variations in the isotopic composition of Mo in nature and in materials produced by laboratory processes. We observe fractionation of Mo isotopes of ∼1.5‰/amu during ion-exchange chromatography in the laboratory and a shift of ∼0.3‰/amu between natural MoS2 and a laboratory standard.

Original languageEnglish (US)
Pages (from-to)1425-1431
Number of pages7
JournalAnalytical chemistry
Volume73
Issue number7
DOIs
StatePublished - Apr 1 2001
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry

Fingerprint Dive into the research topics of 'Precise determination of mass-dependent variations in the isotopic composition of molybdenum using MC-ICPMS'. Together they form a unique fingerprint.

  • Cite this