Iron Transformations Induced by an Acid-Tolerant Desulfosporosinus Species

Bertel, Doug; Peck, John A.; Quick, T.; Senko, John M.

doi:10.1128/aem.06337-11

Cited by 44 publications

(24 citation statements)

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“…Furthermore, we did not detect any iron sulfide, contrary to usual observations of mackinawite (FeS) or greigite (Fe3S4) resulting from Fe(II) reaction with H2S produced upon microbial sulfate reduction (Bertel et al, 2012;Burton et al, 2013). Low sulfate concentrations and highly acidic conditions would have prevented extensive microbial sulfate reduction in the water column of lake 77 (Blodau and Gatzek, 2006;Burton et al, 2013) and instead promoted the transformation of schwertmannite to ferrihydrite with no or minor associated iron sulfide.…”

Section: Accepted M Manuscriptcontrasting

confidence: 86%

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Iron mineralogy across the oxycline of a lignite mine lake

Miot

Morin

et al. 2016

Chemical Geology

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International audienceIron-rich pelagic aggregates of microbial origin named “iron snow” are formed in the water column of some acidic lignite mine lakes. We investigated the evolution of Fe mineralogy across the oxycline of the Lusatian lake 77, Germany at two sampling sites differing by their pH and mixing profiles. The central basin (CB) of this lake shows a dimictic water regime with a non-permanent anoxic deep layer and a homogeneous acidic pH all over the water column (pH 3). In contrast, the northern basin (NB) is meromictic with a permanently anoxic bottom layer and a pH increase from pH 3 in the mixolimnion (superficial part of the lake) to pH 5.5 in the monimolimnion (anoxic bottom layer). Fe minerals above and below the oxycline were identified using X-ray Absorption Spectroscopy (XAS) at the Fe K-edge and further characterized down to the atomic scale by High Resolution Transmission Electron Microscopy (HRTEM) and Scanning Transmission Electron Microscopy (STEM) coupled to Energy Dispersive X-ray Spectroscopy (EDXS). We explored local Fe redox state and C speciation using Scanning Transmission X-ray Microscopy (STXM) at the Fe L2,3-edges and C K-edge. Schwertmannite [Fe8O8(OH)8-2x(SO4)x] identified as the sole Fe mineral in CB, was polycrystalline, consisting in the aggregation of nanodomains of 2–3 nm each one exhibiting the crystal structure of schwertmannite. In contrast, schwertmannite was partly (40%) converted to aluminous ferrihydrite when reaching the oxycline in NB. This mineralogical transformation was most probably due to a combination of abiotic and microbial anaerobic processes promoting pH increase and release of Fe(II) (e.g. via heterotrophic Fe(III) reduction) that induce the catalytic hydrolysis of schwertmannite to ferrihydrite. Mineral products were stabilized in the monimolimnion by the adsorption of aluminum, silicate and organic matter. Noteworthy, local Fe redox state heterogeneities were observed, with a few areas enriched in Fe(II) as evidenced by STXM analyses at the Fe L2,3-edges. These local redox heterogeneities could arise from microbial activity (e.g. Fe(III) and/or sulfate reduction). All these results provide an in-depth mineralogical overview of iron phases forming in lake 77 as a basis for future investigations of microbial vs. abiotic parameters controlling their stability and transformation

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Section: Accepted M Manuscriptcontrasting

confidence: 86%

“…In addition, organic matter associated with schwertmannite aggregates (Fig. 6) could be an attractive ecological niche for heterotrophs, such as acidophilic Fe(III)-reducers (Bertel et al, 2012;Blodau and Gatzek, 2006;Burton et al, 2013;Coupland and Johnson, 2008;Küsel et al, 1999) releasing additionnal Fe(II) as follows:…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Iron mineralogy across the oxycline of a lignite mine lake

Miot

Morin

et al. 2016

Chemical Geology

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“…Members of Desulfosporosinus can use sulfate as an electron acceptor, but some members are also capable of reducing ferric minerals under acidic conditions (Senko et al, 2009; Bertel et al, 2012). We note that during the test, the increase in the genes of Desulfosporosinus occurred after the decrease of groundwater pH, and coincided with the increase in the genes of Geothrix and Geobacter , and with the increase in the concentrations of ferrous iron and sulfate (O'mullan et al, 2015, their Figures 1, 7).…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic and Kinetic Response of Microbial Reactions to High CO2

Jin

Kirk

2016

Front. Microbiol.

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Geological carbon sequestration captures CO2 from industrial sources and stores the CO2 in subsurface reservoirs, a viable strategy for mitigating global climate change. In assessing the environmental impact of the strategy, a key question is how microbial reactions respond to the elevated CO2 concentration. This study uses biogeochemical modeling to explore the influence of CO2 on the thermodynamics and kinetics of common microbial reactions in subsurface environments, including syntrophic oxidation, iron reduction, sulfate reduction, and methanogenesis. The results show that increasing CO2 levels decreases groundwater pH and modulates chemical speciation of weak acids in groundwater, which in turn affect microbial reactions in different ways and to different extents. Specifically, a thermodynamic analysis shows that increasing CO2 partial pressure lowers the energy available from syntrophic oxidation and acetoclastic methanogenesis, but raises the available energy of microbial iron reduction, hydrogenotrophic sulfate reduction and methanogenesis. Kinetic modeling suggests that high CO2 has the potential of inhibiting microbial sulfate reduction while promoting iron reduction. These results are consistent with the observations of previous laboratory and field studies, and highlight the complexity in microbiological responses to elevated CO2 abundance, and the potential power of biogeochemical modeling in evaluating and quantifying these responses.

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“…Different iron-reducing bacterial communities were enriched in the riverine and marine cultures. Six genera of IRB were detected in both riverine and marine enrichment cultures: Desulfotomaculum (Dalla et al 2014), Geothermobacter (Emerson 2009), Clostridium, Desulfosporosinus (Bertel et al 2011), Pseudomonas, and Bacillus (Fig. 5).…”

Section: Identification Of Irb In Iron(iii)-reducing Enrichment Culturesmentioning

confidence: 99%

The differentiation of iron-reducing bacterial community and iron-reduction activity between riverine and marine sediments in the Yellow River estuary

Zhang

Liu

Zheng

et al. 2019

Mar Life Sci Technol

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Rivers are the primary contributors of iron and other elements to the global oceans. Iron-reducing bacteria play an important biogeochemical role in coupling the iron and carbon redox cycles. However, the extent of changes in community structures and iron-reduction activities of iron-reducing bacteria in riverine and coastal marine sediments remains unclear. This study presents information on the spatial patterns and relative abundance of iron-reducing bacteria in sediments of the Yellow River estuary and the adjacent Bohai Sea. High-throughput sequencing of bacterial 16S rRNA found that the highest relative abundances and diversities were from the estuary (Yellow River-Bohai Sea mixing zone). Pseudomonas, Thiobacillus, Geobacter, Rhodoferax, and Clostridium were the most abundant putative iron-reducing bacteria genera in the sediments of the Yellow River. Vibrio, Shewanella, and Thiobacillus were the most abundant in the sediments of the Bohai Sea. The putative iron-reducing bacterial community was positively correlated with the concentrations of total nitrogen and ammonium in coastal marine sediments, and was significantly correlated with the concentration of nitrate in river sediments. The riverine sediments, with a more diverse iron-reducing bacterial community, exhibited increased activity of Fe(III) reduction in enrichment cultures. The estuary-wide high abundance of putative iron-reducing bacteria suggests that the effect of river-sea interaction on bacterial distribution patterns is high. The results of this study will help the understanding of the biogeochemical cycling of iron in riverine and coastal marine environments. Keywords Iron-reducing bacteria • River • Coastal sea • River-sea interaction Edited by Chengchao Chen.

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Iron Transformations Induced by an Acid-Tolerant Desulfosporosinus Species

Cited by 44 publications

References 68 publications

Iron mineralogy across the oxycline of a lignite mine lake

Iron mineralogy across the oxycline of a lignite mine lake

Thermodynamic and Kinetic Response of Microbial Reactions to High CO2

The differentiation of iron-reducing bacterial community and iron-reduction activity between riverine and marine sediments in the Yellow River estuary

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