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Integrated Element Doping and Standard-Sample Bracketing for Enhanced Fe-Zn Isotope Precision in MC-ICPMS
Dong-Yong Li1, Long Chen1,2, Hai-Ou Gu3,4
1Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education (MOE) and College of Marine Geosciences, Ocean University of China, Qingdao, China.
Rapid Communications in Mass Spectrometry : RCM
|April 8, 2025
Summary
This study introduces an improved Fe-Zn isotope analysis method combining standard-sample bracketing (SSB) with element doping. The new technique enhances measurement precision and broadens acceptable concentration ranges for geological samples.
Area of Science:
- Geochemistry
- Analytical Chemistry
- Isotope Geochemistry
Background:
- Standard-sample bracketing (SSB) and element doping are common techniques for correcting instrumental mass bias in Fe-Zn isotope analysis via multicollector inductively coupled plasma mass spectrometry (MC-ICPMS).
- The impact of analyte concentration and spike-analyte ratios on measurement accuracy in these analyses requires further investigation.
Purpose of the Study:
- To develop and evaluate an improved Fe-Zn isotope analysis method.
- To mitigate concentration effects by combining SSB with element doping.
- To assess the influence of Ni/Fe and Cu/Zn ratios and analyte concentrations on isotope precision and accuracy.
Main Methods:
- Developed an improved Fe-Zn isotope analysis method integrating SSB with element doping.
- Systematically evaluated Ni/Fe and Cu/Zn ratios (0.1-2.1).
- Assessed analyte concentrations from 0.1 to 2.0 times the bracketing standards' concentration.
Main Results:
- Variations in Ni/Fe and Cu/Zn ratios had minimal impact on measurement precision when low-concentration isotopes were accurately quantified.
- The combined approach reduced concentration matching constraints by 30%-50% compared to conventional SSB.
- Validation using 10 geological reference materials confirmed the method's reliability, with isotopic values matching published data.
Conclusions:
- The combined SSB and element doping approach improves measurement precision for Fe-Zn isotope analysis.
- This method enhances applicability to a wider range of geological samples.
- It provides a robust technique for Fe-Zn isotope studies.
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