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Distribution Coefficients of the REEs, Sr, Y, Ba, Th, and U between α-HIBA and AG50W-X8 Resin

Li, Haoyu and Tissot, François L. H. and Lee, Seung-Gu and Hyung, Eugenia and Dauphas, Nicolas (2021) Distribution Coefficients of the REEs, Sr, Y, Ba, Th, and U between α-HIBA and AG50W-X8 Resin. ACS Earth and Space Chemistry, 5 (1). pp. 55-65. ISSN 2472-3452. doi:10.1021/acsearthspacechem.0c00273.

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Rare-earth elements (REEs) are known for their similar behaviors, which make their purification through chromatographic techniques particularly challenging. The use of α-hydroxyisobutyric acid (α-HIBA) in combination with a cation-exchange resin is perhaps the most widely used chromatographic technique to separate individual REEs from each other. However, only limited REE partition data between α-HIBA and cation resins exist, which makes it challenging to develop and optimize purification techniques using this platform. Here, we report distribution coefficients (K_d) of REEs, as well as Sr, Y, Ba, Th, and U, between α-HIBA at pH = 4.50 and AG50W-X8 cation-exchange resin, obtained by batch equilibration experiments. For all 19 elements, the distribution coefficients decrease with increasing acid concentration. For the REEs, a linear relationship is observed in log–log space between K_d values and α-HIBA molarity. While the K_d values have been calibrated at pH = 4.50, formulas are provided allowing recasting of the K_d values at any pH. To test the accuracy of the data, we compare elution curves simulated using the newly determined distribution coefficients to actual elution curves. The close agreement between simulated and experimental elution curves demonstrates that the distribution coefficients obtained in this study are effective to devise multielement extraction and purification scheme for high-precision elemental and isotopic analyses of REEs for various applications.

Item Type:Article
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URLURL TypeDescription
Li, Haoyu0000-0002-7192-2470
Tissot, François L. H.0000-0001-6622-2907
Dauphas, Nicolas0000-0002-1330-2038
Additional Information:© 2020 American Chemical Society. Received: October 1, 2020; Revised: December 2, 2020; Accepted: December 2, 2020; Published: December 15, 2020. We thank the three anonymous reviewers and editor Joel D. Blum for constructive criticisms, which greatly helped us to improve the manuscript. This work was supported by grants NASA grants NNX17AE86G, NNX17AE87G, 80NSSC17K0744, and 80NSSC20K0821 and NSF grant EAR-2001098 to N.D.; grant GP2020-003 (provided by Korea Institute of Geoscience and Mineral Resources) to S.-G.L.; NASA grant 80NSSC20K1398 (PI: F.L.H.T., FI: H.L.), NSF grant EAR-1824002, and start-up funds (provided by Caltech) to F.L.H.T. Author Contributions. N.D., F.L.H.T., and S-G.L. conceived the study. S.-G.L. and F.L.H.T. performed the partitioning experiments. H.L. and F.L.H.T. processed and interpreted the data. E.H. conducted Elution 2. H.L. wrote the first draft under F.L.H.T.’s guidance. All authors contributed to writing and/or editing of the manuscript. The authors declare no competing financial interest.
Funding AgencyGrant Number
Korea Institute of Geoscience and Mineral ResourcesGP2020-003
Subject Keywords:distribution coefficients; extraction chromatography; REEs; α-HIBA; AG50W-X8 resin
Issue or Number:1
Record Number:CaltechAUTHORS:20201215-141038772
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Official Citation:Distribution Coefficients of the REEs, Sr, Y, Ba, Th, and U between α-HIBA and AG50W-X8 Resin. Haoyu Li, François L. H. Tissot, Seung-Gu Lee, Eugenia Hyung, and Nicolas Dauphas. ACS Earth and Space Chemistry 2021 5 (1), 55-65; DOI: 10.1021/acsearthspacechem.0c00273
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107104
Deposited By: George Porter
Deposited On:15 Dec 2020 23:03
Last Modified:16 Nov 2021 18:59

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