A Chromatographic Approach for High-Precision Eu Isotope Analysis

Area of Science:

• Geochemistry
• Isotope Geochemistry
• Planetary Science
• Earth Science
• Marine Science

Background:

• Europium (Eu) isotopes are valuable tracers in planetary, earth, and marine science.
• High-precision analysis of Eu isotopes is hindered by the similar geochemical behavior of rare earth elements (REEs).

Purpose of the Study:

• To develop a novel, high-precision chromatographic method for separating Europium (Eu) from interfering elements.
• To establish a robust technique for accurate Eu isotope ratio measurements.
• To enhance the application of Eu isotopes in various scientific fields.

Main Methods:

• A two-column chromatographic separation using AG50W-X12 and TODGA resins was developed for Eu purification.
• High-precision analysis was performed using multicollector-inductively coupled plasma-mass spectrometry (MC-ICP-MS).
• Standard-sample bracketing (SSB) and internal normalization (Nd) were employed for calibration.

Main Results:

• The method achieves high Eu yields (99.4 ± 0.4%) and low procedural blanks (<20 pg).
• Demonstrated robustness across various rock types and Eu loading masses.
• Achieved a long-term external precision of δ^153/151Eu better than 0.04‰ (2SD), a 2-5 fold improvement over previous methods.

Conclusions:

• The developed chromatographic technique provides efficient Eu purification and high-precision isotopic analysis.
• This advancement significantly improves the precision of Eu isotope measurements.
• Opens new possibilities for Eu isotope geochemistry in Earth, planetary, and marine sciences.