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

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

Abstract 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 bey...

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Autores principales: Elaheh Lotfi-Kalahroodi, Anne-Catherine Pierson-Wickmann, Olivier Rouxel, Rémi Marsac, Martine Bouhnik-Le Coz, Khalil Hanna, Mélanie Davranche
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
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Acceso en línea:https://doaj.org/article/1deeff4d6f30401183296c4c5f5b8778
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spelling oai:doaj.org-article:1deeff4d6f30401183296c4c5f5b87782021-12-02T13:48:53ZMore than redox, biological organic ligands control iron isotope fractionation in the riparian wetland10.1038/s41598-021-81494-z2045-2322https://doaj.org/article/1deeff4d6f30401183296c4c5f5b87782021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81494-zhttps://doaj.org/toc/2045-2322Abstract 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.Elaheh Lotfi-KalahroodiAnne-Catherine Pierson-WickmannOlivier RouxelRémi MarsacMartine Bouhnik-Le CozKhalil HannaMélanie DavrancheNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Elaheh Lotfi-Kalahroodi
Anne-Catherine Pierson-Wickmann
Olivier Rouxel
Rémi Marsac
Martine Bouhnik-Le Coz
Khalil Hanna
Mélanie Davranche
More than redox, biological organic ligands control iron isotope fractionation in the riparian wetland
description Abstract 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.
format article
author Elaheh Lotfi-Kalahroodi
Anne-Catherine Pierson-Wickmann
Olivier Rouxel
Rémi Marsac
Martine Bouhnik-Le Coz
Khalil Hanna
Mélanie Davranche
author_facet Elaheh Lotfi-Kalahroodi
Anne-Catherine Pierson-Wickmann
Olivier Rouxel
Rémi Marsac
Martine Bouhnik-Le Coz
Khalil Hanna
Mélanie Davranche
author_sort Elaheh Lotfi-Kalahroodi
title 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_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_sort more than redox, biological organic ligands control iron isotope fractionation in the riparian wetland
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/1deeff4d6f30401183296c4c5f5b8778
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