Nu Instruments | Precise Calcium Isotope Determination with Sapphire MC-ICP-MS
Calcium isotope measurements are valuable for understanding planetary formation, solar system evolution and geological differentiation processes. This application note demonstrates how the Sapphire Dual-Path MC-ICP-MS uses a collision cell to remove argon-based interferences, enabling direct and highly precise measurement of calcium isotopes.
Calcium isotope analysis is widely used in studies of meteorites, planetary materials and terrestrial rocks. Conventional MC-ICP-MS techniques can be limited by strong argon-based interferences that affect measurement precision and make direct analysis of ⁴⁰Ca difficult.
The Sapphire Dual-Path MC-ICP-MS overcomes these challenges using a collision cell with He and H₂ gases to efficiently remove spectral interferences. This approach enables direct measurement of ⁴⁰Ca while reducing the need for high mass resolution methods.
Testing with NIST 915a and 915b standards demonstrated accurate and precise isotope ratio measurements. The results highlight the instrument’s ability to deliver high-quality calcium isotope data while reducing sample requirements by approximately an order of magnitude.
Key Takeaways:
- Direct measurement of ⁴⁰Ca becomes possible through effective interference removal.
- Collision cell technology improves precision while reducing sample consumption.
- Accurate calcium isotope analysis is achieved without relying on high-resolution operation.
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