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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Lotfi-Kalahroodi E,Pierson-Wickmann AC,Rouxel O,Marsac R,Bouhnik-Le Coz M,Hanna K,Davranche Mdoi
10.1038/s41598-021-81494-zsubject
Has Abstractpub_date
2021-01-21 00:00:00pages
1933issue
1issn
2045-2322pii
10.1038/s41598-021-81494-zjournal_volume
11pub_type
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