Precise Determination of Mass-Dependent Variations in the Isotopic Composition of Molybdenum Using MC-ICPMS
- 6 March 2001
- journal article
- research article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 73 (7) , 1425-1431
- https://doi.org/10.1021/ac000829w
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.Keywords
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