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Guénet H, Demangeat E, Davranche M, et al. Experimental evidence of REE size fraction redistribution during redox variation in wetland soil. Sci Total Environ. 2018;631:580-588doi: 10.1016/j.scitotenv.2018.03.005.
Guénet, H., Demangeat, E., Davranche, M., Vantelon, D., Pierson-Wickmann, A. C., Jardé, E., Bouhnik-Le Coz, M., Lotfi, E., Dia, A., & Jestin, J. (2018). Experimental evidence of REE size fraction redistribution during redox variation in wetland soil. The Science of the total environment, 631580-588. https://doi.org/10.1016/j.scitotenv.2018.03.005
Guénet, Hélène, et al. "Experimental evidence of REE size fraction redistribution during redox variation in wetland soil." The Science of the total environment vol. 631 (2018): 580-588. doi: https://doi.org/10.1016/j.scitotenv.2018.03.005
Guénet H, Demangeat E, Davranche M, Vantelon D, Pierson-Wickmann AC, Jardé E, Bouhnik-Le Coz M, Lotfi E, Dia A, Jestin J. Experimental evidence of REE size fraction redistribution during redox variation in wetland soil. Sci Total Environ. 2018 Aug 01;631:580-588. doi: 10.1016/j.scitotenv.2018.03.005. Epub 2018 Mar 16. PMID: 29533794.
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Sci Total Environ. 2018 Aug 01;631:580-588. doi: 10.1016/j.scitotenv.2018.03.005. Epub 2018 Mar 16.

Experimental evidence of REE size fraction redistribution during redox variation in wetland soil.

The Science of the total environment

Hélène Guénet, Edwige Demangeat, Mélanie Davranche, Delphine Vantelon, Anne-Catherine Pierson-Wickmann, Emilie Jardé, Martine Bouhnik-Le Coz, Elaheh Lotfi, Aline Dia, Jacques Jestin

Affiliations

  1. Univ. Rennes, CNRS, Géosciences Rennes, UMR 6118, Campus de Beaulieu, 35042, Rennes Cedex, France.
  2. Univ. Rennes, CNRS, Géosciences Rennes, UMR 6118, Campus de Beaulieu, 35042, Rennes Cedex, France. Electronic address: [email protected].
  3. Synchrotron SOLEIL, L'orme des merisiers, Saint Aubin BP48, 91192 Gif sur Yvette Cedex, France.
  4. Univ Rennes 1, UMR CNRS 6226, Inst Sci Chim Rennes, Ctr Diffractometrie Rayons 10, F-35042 Rennes, France; Laboratoire Léon Brillouin, CEA Saclay, 91191 Gif/Yvette Cedex, France.

PMID: 29533794 DOI: 10.1016/j.scitotenv.2018.03.005

Abstract

The evolution of rare earth element (REE) speciation between reducing and oxidizing conditions in a riparian wetland soil was studied relative to the size fractionation of the solution. In all size fractions obtained from the reduced and oxidized soil solutions, the following analyses were carried out: organic matter (OM) characterization, transmission electron microscopy (TEM) observations as well as major and trace element analyses. Significant REE redistribution and speciation evolution between the various size fractions were observed. Under reducing conditions, the REEs were bound to colloidal and dissolved OM (<2μm size fractions). By contrast, under oxidizing conditions, they were distributed in particulate (>2μm size fraction), colloidal (<2μm size fraction), organic and Fe-enriched fractions. In the particulate size fraction, the REEs were bound to humic and bacterial OM embedding Fe nano-oxides. The resulting REE pattern showed a strong enrichment in heavy REEs (HREEs) in response to REE binding to specific bacterial OM functional groups. In the largest colloidal size fraction (0.2μm-30kDa), the REEs were bound to humic substances (HS). The lowest colloidal size fraction (<30kDa) is poorly concentrated in the REEs and the REE pattern showed an increase in the middle REEs (MREEs) and heavy REEs (HREEs) corresponding to a low REE loading on HS. A comparison of the REE patterns in the present experimental and field measurements demonstrated that, in riparian wetlands, under a high-water level, reducing conditions are insufficient to allow for the dissolution of the entire Fe nano-oxide pool formed during the oxidative period. Therefore, even under reducing conditions, Fe(III) seems to remain a potential scavenger of REEs.

Copyright © 2018 Elsevier B.V. All rights reserved.

Keywords: Colloid; Iron; Nanoparticles; Organic matter; Rare earth elements; Redox alternation; Wetland

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