Single-step chromatographic isolation of lithium from whole-rock carbonate and clay for isotopic analysis with multi-collector ICP-mass spectrometry

Van Hoecke, K. and Belza, J. and Croymans, T. and Misra, S. and Claeys, P. and Vanhaecke, F. (2015) Single-step chromatographic isolation of lithium from whole-rock carbonate and clay for isotopic analysis with multi-collector ICP-mass spectrometry. Journal of Analytical Atomic Spectrometry, 30 (12). pp. 2533-2540. ISSN 0267-9477 ESSN: 1364-5544 DOI 10.1039/C5JA00165J

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Abstract

Lithium isotope ratios play a key role in tracing weathering processes within the context of paleoclimatologic research. Therefore, accurate and precise determination of the isotopic composition of Li is required for a large variety of complex geological samples with widely different Li contents. This technical note describes the extension and fine-tuning of the existing cation exchange chromatographic procedures for isolation of Li to whole-rock carbonate and clay matrices prior to its isotopic analysis via multi-collector ICP-mass spectrometry. The method developed permits the isolation of ≥20 ng amounts of Li from carbonates and clays, by using a 25 cm long cylindrical column loaded with 8 and 2 mL of AG-50W-X8 cation exchange resin, respectively. A 0.5 M HCl solution is used as eluent. Li recoveries ≥99% were achieved and isotopic analysis using 10–20 ng of isolated Li resulted in accurate and precise δ7Li values – external precision (2SE) of 0.2‰ (N = 15). The analytical procedures developed allow Li isotope ratios to be investigated in parallel in both the clay and carbonate fractions of a geological sample within the context of paleoclimatological research.

Item Type: Article
Uncontrolled Keywords: 2015AREP; IA70; weekly list
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Journal of Analytical Atomic Spectrometry
Volume: 30
Page Range: pp. 2533-2540
Identification Number: 10.1039/C5JA00165J
Depositing User: Sarah Humbert
Date Deposited: 17 Jan 2016 00:36
Last Modified: 17 Jan 2016 00:36
URI: http://eprints.esc.cam.ac.uk/id/eprint/3512

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