Evidence for the Fe(II)-Fe(III) Green Rust "Fougérite" mineral occurrence in a hydromorphic soil and its transformation with depth

Mössbauer spectroscopy is used to characterize a Green Rust as a natural mineral for the first time. Samples are taken from a hydromorphic soil under the forest at Fougères (Brittany, France) during spring season. Spectra are compared with those of synthetic Green Rusts (GRs), i.e. hydroxy-chloride,...

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Bibliographic Details
Published in:Hyperfine interactions 1998, Vol.112 (1/4), p.235-238
Main Authors: Abdelmoula, Mustapha, Trolard, F., Bourrié, G., Génin, M.
Format: Article
Language:English
Subjects:
Chemical Physics
Environmental Sciences
Physics
Online Access:Get full text
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Summary:Mössbauer spectroscopy is used to characterize a Green Rust as a natural mineral for the first time. Samples are taken from a hydromorphic soil under the forest at Fougères (Brittany, France) during spring season. Spectra are compared with those of synthetic Green Rusts (GRs), i.e. hydroxy-chloride, -sulphate, -carbonate and display one ferric and one or two ferrous sites. Fe(II)/Fe(III) abundances ratio cannot be attributed definitely to one of those stoichiometric compounds. Therefore, the counter-anion species cannot be specified even though hyperfine parameters perfectly match values of synthetic samples. The Fe(II)/Fe(III) ratio obtained from the Mössbauer spectra decreases with sampling depth. The "fougerite" originates likely from the reduction of deeper Fe(III)-mineral species by anoxic waterlogging.
ISSN:0304-3843
1572-9540
DOI:10.1023/A:1010802508927