Determination of molybdenum isotope fractionation by double-spike multicollector inductively coupled plasma mass spectrometry
Open accessAbstract
Molybdenum isotopic compositions are precisely determined by MC‐ICP‐MS measurements using a Mo double spike. The double spike is added prior to chemical purification, so that laboratory and instrumental mass fractionations are separated from natural mass‐dependent fractionation. Fractionation is determined on four Mo mass ratios, providing an internal consistency check. The external standard reproducibility is at 0.06 per mil on the 98Mo/95Mo ratio (2 standard deviation)). Using a normal microconcentric nebuliser with a cyclonic spray chamber, the minimum quantity of Mo is ∼1 μg for high‐precision results. A hydrothermal molybdenite shows fractionation of −0.3 per mil on the 98Mo/95Mo ratio relative to our standard (Johnson Matthey, 1000 μg/mL (±0.3%) ICP standard solution, lot 602332B). Fine‐grained sediments show fractionation of 0.1 and −0.3 per mil on the 98Mo/95Mo ratio. The observed Mo isotope fractionation is small but resolvable with the presented high‐resolution technique.
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The double-spike data reduction model follows the iterative method of Siebert et al. (2001).
“The double-spike data reduction model is based on the iterative method described by (Siebert et al., 2001).”
From The chromium isotope composition of reducing and oxic marine sediments (2016) · cites this paper as Siebert et al., 2001
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- Authors
- Siebert, C., Nägler, T. F., & Kramers, J. D.
- Affiliations
- University of Bern (CH)
- Corresponding author
- Siebert, Christopher
- Nägler, Thomas F.
- Kramers, Jan D.
- Venue
- Geochemistry Geophysics Geosystems
- Publisher
- American Geophysical Union (AGU)
- Published
- 2001-07
- Volume
- 2
- Issue
- 7
- ISSN
- 1525-2027 (ISSN-L)
- OpenAlex
- W1524978295
- Cited by
- 456
- References
- 19
- Citations by year
- 2026: 24 · 2025: 21 · 2024: 27 · 2023: 25 · 2022: 25 · 2021: 38 · 2020: 31 · 2019: 21 · 2018: 27 · 2017: 29 · 2016: 18 · 2015: 26 · 2014: 17 · 2013: 23 · 2012: 18
- FWCI
- 5.53
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Geochemistry Geophysics Geosystems (publishedVersion)
- BORIS (University Library Bern) (submittedVersion, other-oa)
- Open Access CRIS of the University of Bern
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Chemistry › Analytical Chemistry › Analytical chemistry methods development
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Keywords
- molybdenum isotopes, isotope fractionation, double-spike method, multi-collector ICP-MS, mass-dependent fractionation, molybdenite, nebulizer
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