Pulse Brain · Growing Health Evidence Index
Peer-reviewed

Iron Isotope Fractionations Reveal a Finite Bioavailable Fe Pool for Structural Fe(III) Reduction in Nontronite

Bingjie Shi, Kai Liu, Lingling Wu, Weiqiang Li, C. M. Smeaton, Brian L. Beard, Clark M. Johnson, Eric Roden, Philippe Van Cappellen

Environmental Science & Technology · 2016

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Summary

We report on stable Fe isotope fractionation during microbial and chemical reduction of structural Fe(III) in nontronite NAu-1. (56)Fe/(54)Fe fractionation factors between aqueous Fe(II) and structural Fe(III) ranged from -1.2 to +0.8‰. Microbial (Shewanella oneidensis and Geobacter sulfurreducens) and chemical (dithionite) reduction experiments revealed a two-stage process. Stage 1 was characterized by rapid reduction of a finite Fe(III) pool along the edges of the clay particles, accompanied by a limited release to solution of Fe(II), which partially adsorbed onto basal planes. Stable Fe isotope compositions revealed that electron transfer and atom exchange (ETAE) occurred between edge-bound Fe(II) and octahedral (structural) Fe(III) within the clay lattice, as well as between aqueous Fe

Source type
Peer-reviewed study
DOI
10.1021/acs.est.6b02019
Catalogue ID
BFmokjoedh-ry2r2g
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