Qasid Ahmad, Damien Cividini & Béatrice Luais
Journal of Analytical Atomic Spectrometry, 41(3), 935–941
Voir en ligne : https://doi.org/10.1039/D5JA00471C
Germanium (Ge) isotope measurements (δ74/70Ge relative to NIST3120a) have attracted increasing attention in geochemistry and cosmochemistry; however, analyses of silicate material with low Ge contents remain difficult due to complex sample preparation and purification procedures. Here, we present a novel double-stack chromatographic procedure that purifies Ge from silicate digests. This protocol reduces evaporation steps and overall processing time, allowing higher sample throughput while preserving quantitative Ge recovery (∼100%) and low procedural blanks (<0.1 ng Ge), together with effective matrix removal. Because Ge yields are quantitative under the conditions tested, this method is suitable for measuring Ge isotope signatures without the need for a double spike. This fast, user-friendly chemistry should broaden routine use of Ge isotopes in isotope geo- and cosmochemistry.