High-precision determination of stable potassium and magnesium isotopes utilizing single column separation and multicollector inductively coupled plasma mass spectrometry

Abstract

With advances in analytical precision by multicollector inductively coupled plasma mass spectrometry, K and Mg isotopes are increasingly used as a combined tool in tracing sources and processes in geoscientific research. However, reported methods in the literature require at least two column separation procedures during sample purification, which is time-consuming (at least two days). Therefore, a single column procedure could improve efficiencies, and these efforts are necessary to extend the combined application of K and Mg isotopes as geological tracers. In this study, a simple and time-efficient chromatographic procedure was reported, utilizing a single column for quantitative separation of both K and Mg from sample matrices for high-precision isotopic measurement of K and Mg. Using this novel method, the results for international geological standards agreed with published values, verifying the robustness of the procedure. The popularization of this optimized procedure would potentially extend the combined application of K and Mg isotopes in geological studies.