| Distribution coefficients of 60 elements on TODGA resin: application to Ca, Lu, Hf, U and Th isotope geochemistry. | |
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MedLine Citation:
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PMID: 20298848 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Batch equilibration experiments are conducted to measure the distribution coefficients (K(d)) of a large number of elements in nitric, nitric plus hydrofluoric, and hydrochloric acids on Eichrom TODGA extraction chromatography resin. The K(d)s are used to devise a multi-element extraction scheme for high-precision elemental and isotopic analyses of Ca, Hf, Lu, Th and U in geological materials, using high-purity lithium metaborate (LiBO(2)) flux fusion that allows rapid digestion of even the most refractory materials. The fusion melt, dissolved in nitric acid, is directly loaded to a TODGA cartridge on a vacuum chamber for elemental separation. An Ln-Spec cartridge is used in tandem with TODGA for Lu purification. The entire procedure, from flux digestion to preparation for isotopic analysis, can be completed in a day. The accuracy of the proposed technique is tested by measuring the concentrations of Ca (standard bracketing), Hf, Lu, Th and U (isotope dilution), and the isotopic composition of Hf in geostandards (USNM3529, BCR-2, BHVO-1, AGV-1 and AGV-2). All measurements are in excellent agreement with recommended literature values, demonstrating the effectiveness of the proposed analytical procedure and the versatility of TODGA resin. |
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Authors:
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Ali Pourmand; Nicolas Dauphas |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2010-01-22 |
Journal Detail:
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Title: Talanta Volume: 81 ISSN: 1873-3573 ISO Abbreviation: Talanta Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-03-19 Completed Date: 2010-10-26 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2984816R Medline TA: Talanta Country: England |
Other Details:
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Languages: eng Pagination: 741-53 Citation Subset: - |
Affiliation:
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Origins Laboratory, Department of the Geophysical Sciences and Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA. apourmand@rsmas.miami.edu |
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