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More than redox, biological organic ligands control iron isotope fractionation in the riparian wetland

Although redox reactions are recognized to fractionate iron (Fe) isotopes, the dominant mechanisms controlling the Fe isotope fractionation and notably the role of organic matter (OM) are still debated. Here, we demonstrate how binding to organic ligands governs Fe isotope fractionation beyond that...

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Autores principales: Lotfi-Kalahroodi, Elaheh, Pierson-Wickmann, Anne-Catherine, Rouxel, Olivier, Marsac, Rémi, Bouhnik-Le Coz, Martine, Hanna, Khalil, Davranche, Mélanie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7820352/
https://www.ncbi.nlm.nih.gov/pubmed/33479360
http://dx.doi.org/10.1038/s41598-021-81494-z
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author Lotfi-Kalahroodi, Elaheh
Pierson-Wickmann, Anne-Catherine
Rouxel, Olivier
Marsac, Rémi
Bouhnik-Le Coz, Martine
Hanna, Khalil
Davranche, Mélanie
author_facet Lotfi-Kalahroodi, Elaheh
Pierson-Wickmann, Anne-Catherine
Rouxel, Olivier
Marsac, Rémi
Bouhnik-Le Coz, Martine
Hanna, Khalil
Davranche, Mélanie
author_sort Lotfi-Kalahroodi, Elaheh
collection PubMed
description Although redox reactions are recognized to fractionate iron (Fe) isotopes, the dominant mechanisms controlling the Fe isotope fractionation and notably the role of organic matter (OM) are still debated. Here, we demonstrate how binding to organic ligands governs Fe isotope fractionation beyond that arising from redox reactions. The reductive biodissolution of soil Fe(III) enriched the solution in light Fe isotopes, whereas, with the extended reduction, the preferential binding of heavy Fe isotopes to large biological organic ligands enriched the solution in heavy Fe isotopes. Under oxic conditions, the aggregation/sedimentation of Fe(III) nano-oxides with OM resulted in an initial enrichment of the solution in light Fe isotopes. However, heavy Fe isotopes progressively dominate the solution composition in response to their binding with large biologically-derived organic ligands. Confronted with field data, these results demonstrate that Fe isotope systematics in wetlands are controlled by the OM flux, masking Fe isotope fractionation arising from redox reactions. This work sheds light on an overseen aspect of Fe isotopic fractionation and calls for a reevaluation of the parameters controlling the Fe isotopes fractionation to clarify the interpretation of the Fe isotopic signature.
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spelling pubmed-78203522021-01-22 More than redox, biological organic ligands control iron isotope fractionation in the riparian wetland Lotfi-Kalahroodi, Elaheh Pierson-Wickmann, Anne-Catherine Rouxel, Olivier Marsac, Rémi Bouhnik-Le Coz, Martine Hanna, Khalil Davranche, Mélanie Sci Rep Article Although redox reactions are recognized to fractionate iron (Fe) isotopes, the dominant mechanisms controlling the Fe isotope fractionation and notably the role of organic matter (OM) are still debated. Here, we demonstrate how binding to organic ligands governs Fe isotope fractionation beyond that arising from redox reactions. The reductive biodissolution of soil Fe(III) enriched the solution in light Fe isotopes, whereas, with the extended reduction, the preferential binding of heavy Fe isotopes to large biological organic ligands enriched the solution in heavy Fe isotopes. Under oxic conditions, the aggregation/sedimentation of Fe(III) nano-oxides with OM resulted in an initial enrichment of the solution in light Fe isotopes. However, heavy Fe isotopes progressively dominate the solution composition in response to their binding with large biologically-derived organic ligands. Confronted with field data, these results demonstrate that Fe isotope systematics in wetlands are controlled by the OM flux, masking Fe isotope fractionation arising from redox reactions. This work sheds light on an overseen aspect of Fe isotopic fractionation and calls for a reevaluation of the parameters controlling the Fe isotopes fractionation to clarify the interpretation of the Fe isotopic signature. Nature Publishing Group UK 2021-01-21 /pmc/articles/PMC7820352/ /pubmed/33479360 http://dx.doi.org/10.1038/s41598-021-81494-z Text en © The Author(s) 2021 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Lotfi-Kalahroodi, Elaheh
Pierson-Wickmann, Anne-Catherine
Rouxel, Olivier
Marsac, Rémi
Bouhnik-Le Coz, Martine
Hanna, Khalil
Davranche, Mélanie
More than redox, biological organic ligands control iron isotope fractionation in the riparian wetland
title More than redox, biological organic ligands control iron isotope fractionation in the riparian wetland
title_full More than redox, biological organic ligands control iron isotope fractionation in the riparian wetland
title_fullStr More than redox, biological organic ligands control iron isotope fractionation in the riparian wetland
title_full_unstemmed More than redox, biological organic ligands control iron isotope fractionation in the riparian wetland
title_short More than redox, biological organic ligands control iron isotope fractionation in the riparian wetland
title_sort more than redox, biological organic ligands control iron isotope fractionation in the riparian wetland
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7820352/
https://www.ncbi.nlm.nih.gov/pubmed/33479360
http://dx.doi.org/10.1038/s41598-021-81494-z
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