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Rubidium purification via a single chemical column and its isotope measurement on geological standard materials by MC-ICP-MS

Abstract

A choromotagraphic procedure for Rb, K, Ba and Sr one-by-one separation from geological materials has been developed by using a single-column with packing Sr-spec resin, followed by high-precision Rb isotope measurement on multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The main matrix elements (Ti, Al, Mg, Fe, Mn, Na and Ca) were removed with 4.4 mL of 3 M HNO3 first; Rb and K were then sequentially eluted in different volumes with the same acid. After that, Ba was eluted by 8 M HNO3, and Sr was finally eluted by Milli-Q water. This procedure enables us to collect the pure Rb, K, Ba and Sr one by one in a single-column with recovery close to 100%. The purified Rb was measured by using standard-sample-bracketing method on MC-ICP-MS. The short-term precision for δ87Rb is better than ± 0.03‰ (2SD, for 15 hours), and the long-term (more than 12 months) external precision was better than ± 0.06‰ (2SD) based on repeated analyses of Rb standard solution NIST SRM 984. Matirx effects on Rb isotope measurement on MC-ICP-MS were tested by dopping pure Rb standard with various amounts of matrix elements and are insignificant when Na/Rb<2, Ca/Rb<4 and K/Rb<25. We measured a set of geological reference standards by this method and found significant Rb isotopic variation. Our study suggests that Rb isotope geochemistry may be a potential tracer of various cosmochemical and geological processes.

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Publication details

The article was received on 11 Dec 2017, accepted on 04 Jan 2018 and first published on 04 Jan 2018


Article type: Technical Note
DOI: 10.1039/C7JA00406K
Citation: J. Anal. At. Spectrom., 2018, Accepted Manuscript
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    Rubidium purification via a single chemical column and its isotope measurement on geological standard materials by MC-ICP-MS

    Z. Zhang, J. Ma, L. Zhang, Y. Liu and G. Wei, J. Anal. At. Spectrom., 2018, Accepted Manuscript , DOI: 10.1039/C7JA00406K

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