Arsenic cavenging by aluminum-substituted ferrihydrites in a circumneutral ph river impacted by acid mine drainage
| Autor: | Odile Bruneel, Areej Adra, Guillaume Morin, Farid Juillot, Georges Ona-Nguema, Corinne Casiot, Jessica Brest, Nicolas Menguy, Fabien Maillot, S. Lebrun |
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| Přispěvatelé: | Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), Department of Earth and Planetary Sciences [St Louis], Washington University in Saint Louis (WUSTL), Hydrosciences Montpellier (HSM), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2013 |
| Předmět: |
Geologic Sediments
Inorganic chemistry chemistry.chemical_element 010501 environmental sciences 010502 geochemistry & geophysics 01 natural sciences Ferric Compounds Mining Arsenic Ferrihydrite Microscopy Electron Transmission Rivers X-Ray Diffraction Environmental Chemistry Scavenging 0105 earth and related environmental sciences Minerals Mineral Extended X-ray absorption fine structure Schwertmannite Sediment Spectrometry X-Ray Emission General Chemistry Acid mine drainage [SDE.ES]Environmental Sciences/Environmental and Society 6. Clean water X-Ray Absorption Spectroscopy chemistry 13. Climate action Environmental chemistry France Acids Aluminum |
| Zdroj: | Environmental Science and Technology Environmental Science and Technology, American Chemical Society, 2013, 47, pp.12784-12792. ⟨10.1021/es4020234⟩ Environmental Science and Technology, 2013, 47, pp.12784-12792. ⟨10.1021/es4020234⟩ |
| ISSN: | 0013-936X 1520-5851 |
| Popis: | International audience; Ferrihydrite (Fh) is a nanocrystalline ferric oxyhydroxide involved in the retention of pollutants in natural systems and in water-treatment processes. The status and properties of major chemical impurities in natural Fh is however still scarcely documented. Here we investigated the structure of aluminum-rich Fh, and their role in arsenic scavenging in river-bed sediments from a circumneutral river (pH 6−7) impacted by an arsenic-rich acid mine drainage (AMD). Extended X-ray absorption fine structure (EXAFS) spectroscopy at the Fe K-edge shows that Fh is the predominant mineral phase forming after neutralization of the AMD, in association with minor amount of schwertmannite transported from the AMD. TEM-EDXS elemental mapping and SEM-EDXS analyses combined with EXAFS analysis indicates that Al3+ substitutes for Fe3+ ions into the Fh structure in the natural sediment samples, with local aluminum concentration within the 25−30 ± 10 mol %Al range. Synthetic aluminous Fh prepared in the present study are found to be less Al-substituted (14−20 ± 5 mol %Al). Finally, EXAFS analysis at the arsenic Kedge indicates that As(V) form similar inner-sphere surface complexes on the natural and synthetic Al-substituted Fh studied. Our results provide direct evidence for the scavenging of arsenic by natural Al-Fh, which emphasize the possible implication of such material for scavenging pollutants in natural or engineered systems. |
| Databáze: | OpenAIRE |
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