Mössbauer spectrometry insights into the redox reactivity of Fe-bearing phases in the environment - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Journal of Materials Research Year : 2023

Mössbauer spectrometry insights into the redox reactivity of Fe-bearing phases in the environment

Abstract

Rates and mechanisms of important reactions in the cycling of electrons via the geochemical transformations of iron have been identified using Mössbauer spectrometry. The cycling of iron through various reservoirs (aquifer, soils, sediments, claystone) depends on high surface-area-to-volume ratios of Fe-bearing solids. The ability of Fe-bearing solids surfaces to interact chemically, through surface complexation, and ligand exchange mechanisms, with reductants such as FeII, and oxidants such as Se, U, Tc, Co, Eu, and O2 facilitates electron transfer as well as dissolution and precipitation. Various pathways have been assessed on the basis of laboratory experiments for application to natural and engineered systems. FeII in the structure of layered silicates, oxides (e.g., Fe3O4) and hydrous oxides, and sulfides, as well as FeII surface complexes, such as on clay mineral edges, are very efficient reductants from a thermodynamic as well as from a kinetic point of view.

Dates and versions

insu-04027115 , version 1 (13-03-2023)

Identifiers

Cite

Laurent Charlet, Jean-Marc Grenèche, Christophe Tournassat, Paul Wersin, Antoine Géhin, et al.. Mössbauer spectrometry insights into the redox reactivity of Fe-bearing phases in the environment. Journal of Materials Research, 2023, 38 (4), pp.958-973. ⟨10.1557/s43578-022-00823-8⟩. ⟨insu-04027115⟩
27 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More