Co-reduction of Fe(III) and S0 drives Fe-S biomineral formation and phosphate mobilisation
Bronner R, Thompson K, Dreher C, Runge E, Voggenreiter E, Shuster J, Joshi P, Fischer S, Duda JP, Kappler A, Mansor M (2023)
Publication Type: Journal article
Publication year: 2023
Journal
Original Authors: R. Bronner, K. Thompson, C. Dreher, E. Runge, E. Voggenreiter, J. Shuster, B. Wan, P. Joshi, S. Fischer, J.-P. Duda, A. Kappler, M. Mansor
Book Volume: 24
Pages Range: 27-32
Abstract
Microbially mediated iron and sulfur cycling have impacted redox transitions and the bioavailability of nutrients throughout Earth’s history. Here, we incubated Geobacter sulfurreducens in the co-presence of ferrihydrite and S0 at pH 6.5, 7.2 or 8.0. Microbial reduction of Fe(III) and S0 resulted in a shift from ferruginous (Fe2+-rich) to sulfidic (sulfide-rich) conditions and the precipitation of mackinawite, greigite and vivianite. The initial pH controlled the timing of the ferruginous-sulfidic transition and the relative abundance and crystallinity of the formed minerals. Vivianite formation was attributed to phosphate initially added to the medium. Phosphate showed a dynamic cycle, with low dissolved concentrations initially due to sorption to ferrihydrite, followed by vivianite precipitation under ferruginous conditions, and a significant release under sulfidic conditions. Co-reduction of Fe(III) and S0 therefore regulates Fe-S biomineral formation and P bioavailability, which could be particularly important to consider in microbial mats and the sulfate-poor Archean ocean.
Involved external institutions
Germany (DE)How to cite
APA:
Bronner, R., Thompson, K., Dreher, C., Runge, E., Voggenreiter, E., Shuster, J.,... Mansor, M. (2023). Co-reduction of Fe(III) and S0 drives Fe-S biomineral formation and phosphate mobilisation. Geochemical Perspectives Letters, 24, 27-32. https://doi.org/10.7185/geochemlet.2301
MLA:
Bronner, R., et al. "Co-reduction of Fe(III) and S0 drives Fe-S biomineral formation and phosphate mobilisation." Geochemical Perspectives Letters 24 (2023): 27-32.
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