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Published on: May 22, 2015
Fe isotope variations in natural materials measured using high mass resolution multiple collector ICPMS
G L Arnold1, S Weyer, A D Anbar
1Department of Earth and Environmental Sciences, University of Rochester, Rochester, New York 14627, USA.
This study introduces high-resolution MC-ICPMS for precise iron (Fe) isotope measurements in natural samples. This method overcomes interferences, enabling accurate analysis of geological materials.
Area of Science:
- Geochemistry
- Isotope Geochemistry
- Analytical Chemistry
Background:
- Iron (Fe) isotope variations provide insights into geological and biological processes.
- Accurate measurement of Fe isotopes is crucial for understanding these processes.
- Existing methods face challenges with polyatomic interferences and mass bias.
Purpose of the Study:
- To present the first measurements of Fe isotope variations using high-resolution MC-ICPMS.
- To demonstrate the utility of this technique for natural samples.
- To highlight the importance of internal mass bias monitoring.
Main Methods:
- Chemically purified natural samples (basalt, paleosol) analyzed using high-resolution MC-ICPMS.
- Polyatomic interferences resolved using high mass resolution.
- Copper (Cu) "element spike" used as an internal standard for mass bias correction.
Main Results:
- Achieved external precision of 0.03-0.11‰ for delta(56/54)Fe and 0.04-0.15‰ for delta(57/54)Fe (2sigma).
- Demonstrated successful resolution of interferences like (40)Ar(14)N(+), (40)Ar(16)O(+), and (40)Ar(16)OH(+).
- Confirmed the necessity of Cu internal standard for high reproducibility.
Conclusions:
- High-resolution MC-ICPMS is a powerful tool for precise Fe isotope analysis in diverse natural materials.
- Effective internal monitoring of mass bias is critical for routine Fe isotope measurements.
- This technique advances the study of geochemical cycles and Earth processes.
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