FN Archimer Export Format
PT J
TI More than redox, biological organic ligands control iron isotope fractionation in the riparian wetland
BT 
AF Lotfi-Kalahroodi, Elaheh
   Pierson-Wickmann, Anne-Catherine
   Rouxel, Olivier
   Marsac, Rémi
   Bouhnik-Le Coz, Martine
   Hanna, Khalil
   Davranche, Mélanie
AS 1:1;2:1;3:2;4:1;5:1;6:3;7:1;
FF 1:;2:;3:PDG-REM-GM;4:;5:;6:;7:;
C1 Univ. Rennes, CNRS, Géosciences Rennes - UMR 6118, 35000, Rennes, France
   IFREMER, Unité de Géosciences Marines, 29280, Plouzané, France
   Univ. Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS ISCR UMR6226, 35000, Rennes, France
C2 UNIV RENNES, FRANCE
   IFREMER, FRANCE
   UNIV RENNES, FRANCE
SI BREST
SE PDG-REM-GM
IN WOS Ifremer UPR
   DOAJ
   copubli-france
   copubli-univ-france
IF 4.997
TC 5
UR https://archimer.ifremer.fr/doc/00677/78931/81302.pdf
   https://archimer.ifremer.fr/doc/00677/78931/81303.pdf
LA English
DT Article
AB 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. 
PY 2021
PD JAN
SO Scientific Reports
SN 2045-2322
PU Springer Science and Business Media LLC
VL 11
IS 1
UT 000612982200076
DI 10.1038/s41598-021-81494-z
ID 78931
ER

EF