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Trace Element Microanalysis in Iron Meteorites by Laser Ablation ICPMS
1Department of the Geophysical Sciences, The University of Chicago, Chicago, Illinois 60637.
Analytical Chemistry
|June 14, 2011
Summary
A new laser ablation microanalysis system achieves ppb sensitivity for trace elements, enabling detailed platinum group element analysis in iron meteorites with high spatial resolution. This method accurately maps chemical zoning, surpassing previous techniques.
Area of Science:
- Geochemistry
- Analytical Chemistry
- Materials Science
Background:
- Trace element analysis in geological samples requires high sensitivity and spatial resolution.
- Previous methods like SIMS have limitations in analyzing certain elements or resolving fine chemical zoning.
- Laser ablation coupled with ICP-MS offers potential for improved solid sample analysis.
Purpose of the Study:
- To develop and demonstrate a laser ablation microanalysis system for trace element determination.
- To apply this system to analyze platinum group elements (PGEs) in iron meteorites.
- To achieve high spatial resolution and accurately map chemical zoning in geological samples.
Main Methods:
- Utilized a CETAC LSX-200 laser ablation system coupled with a Finnigan Element magnetic sector inductively coupled plasma mass spectrometry (ICP-MS).
- Analyzed trace elements, including PGEs, in iron meteorites with a spatial resolution of approximately 20 μm.
- Performed bulk composition analysis, chemical zoning determination, and depth profiling.
Main Results:
- Achieved trace element sensitivity in the parts per billion (ppb) range.
- Demonstrated spatial resolution comparable to dynamic secondary ion mass spectrometry (SIMS).
- Successfully recovered chemical zoning for Ru, Rh, and Pd in taenite lamellae, which was not possible with SIMS.
Conclusions:
- Magnetic sector ICP-MS coupled with laser ablation is an effective method for trace element analysis.
- This technique offers high sensitivity, low background, and accurate chemical zoning recovery.
- The developed system provides a powerful tool for analyzing complex geological materials like iron meteorites.
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