Fast microbial reduction of ferrihydrite colloids from a soil effluent

Fritzsche, Andreas; Bosch, Julian; Rennert, Thilo; Heister, Katja; Braunschweig, Juliane; Totsche, Kai Uwe

doi:10.1016/j.gca.2011.10.037

Cited by 26 publications

(16 citation statements)

References 95 publications

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“…An OM-mediated deceleration of microbial Fe(III) reduction is likely to be expected only in cases when this OM accumulates on the surface of iron (oxyhydr-)oxides, a process that passivates the surface for further electron uptake due to an electron nonconducting layer. Generally, pedogenic Fe(III)–OM coprecipitates were found to become quickly and completely reduced, and another work suggests that reducibility is maintained or increased through reduction and oxidation events …”

Section: Environmental Implicationsmentioning

confidence: 99%

Organic Matter from Redoximorphic Soils Accelerates and Sustains Microbial Fe(III) Reduction

Fritzsche

Bosch

Sander

et al. 2021

Environ. Sci. Technol.

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Microbial reduction of Fe(III) minerals is a prominent process in redoximorphic soils and is strongly affected by organic matter (OM). We herein determined the rate and extent of microbial reduction of ferrihydrite (Fh) with either adsorbed or coprecipitated OM by Geobacter sulfurreducens. We focused on OM-mediated effects on electron uptake and alterations in Fh crystallinity. The OM was obtained from anoxic soil columns (effluent OM, efOM) and includedunlike waterextractable OMcompounds released by microbial activity under anoxic conditions. We found that organic molecules in efOM had generally no or only very low electron-accepting capacity and were incorporated into the Fh aggregates when coprecipitated with Fh. Compared to OM-free Fh, adsorption of efOM to Fh decelerated the microbial Fe(III) reduction by passivating the Fh surface toward electron uptake. In contrast, coprecipitation of Fh with efOM accelerated the microbial reduction, likely because efOM disrupted the Fh structure, as noted by Mossbauer spectroscopy. Additionally, the adsorbed and coprecipitated efOM resulted in a more sustained Fe(III) reduction, potentially because efOM could have effectively scavenged biogenic Fe(II) and prevented the passivation of the Fh surface by the adsorbed Fe(II). Fe(III)−OM coprecipitates forming at anoxic−oxic interfaces are thus likely readily reducible by Fe(III)-reducing bacteria in redoximorphic soils.

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Section: Environmental Implicationsmentioning

confidence: 99%

Organic Matter from Redoximorphic Soils Accelerates and Sustains Microbial Fe(III) Reduction

Fritzsche

Bosch

Sander

et al. 2021

Environ. Sci. Technol.

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“…The strain was cultivated using standard anaerobic techniques at 30 °C in the dark as described before (Fritzsche et al, 2012). The medium was supplemented with trace elements, selenitetungsten, and vitamins solutions.…”

Section: Microorganisms and Cultivationmentioning

confidence: 99%

Citrate influences microbial Fe hydroxide reduction via a dissolution–disaggregation mechanism

Braunschweig

Klier

Schröder

et al. 2014

Geochimica et Cosmochimica Acta

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Please cite this article as: Braunschweig, J., Klier, C., Schröder, C., Händel, M., Bosch, J., Totsche, K.U., Meckenstock, R.U., Citrate influences microbial Fe hydroxide reduction via a dissolution-disaggregation mechanism, Geochimica et Cosmochimica Acta (2014), doi: http://dx.doi.org/10.1016/j.gca. 2014.05.006 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Modelling of abiotic dissolution kinetics revealed that colloid stabilization was most pronounced at citrate:Fe ratios of 0.1 -0.5, whereas higher ratios led to enhanced dissolution of both colloidal and larger aggregated fractions. Mathematical simulation of the microbial reduction kinetics under consideration of partial dissolution and colloid stabilization showed that the bioaccessibility increases in the order large aggregates < stable colloids < Fe-citrate.These findings indicate that much of the organic acid driven mobilization of Fe oxy(hydr)oxides is most likely due to colloid formation and stabilization rather than solubilisation.

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“…Environmental iron oxide colloids have been shown to be highly reactive in microbial iron reduction [34].…”

Section: Consequences Of Pyrite Depletion In Anoxic Sedimentsmentioning

confidence: 99%

Rates and potential mechanism of anaerobic nitrate-dependent microbial pyrite oxidation

Bosch

2012

Biochemical Society Transactions

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Pyrite (FeS2) is a major iron- and sulfur-containing mineral phase in the environment. Oxidation of pyrite by aerobic micro-organisms has been well investigated. However, the reactivity of pyrite under anoxic conditions is still an open question. In the present paper, we summarize field and laboratory data on this chemolithotrophic respiration process with nitrate as terminal electron acceptor. Geochemical and stable isotope field data indicate that this process is occurring. Laboratory studies are more ambiguous, but recent positive results provide evidence that anaerobic microbial pyrite oxidation can, in fact, occur with nitrate as electron acceptor.

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Fast microbial reduction of ferrihydrite colloids from a soil effluent

Cited by 26 publications

References 95 publications

Organic Matter from Redoximorphic Soils Accelerates and Sustains Microbial Fe(III) Reduction

Organic Matter from Redoximorphic Soils Accelerates and Sustains Microbial Fe(III) Reduction

Citrate influences microbial Fe hydroxide reduction via a dissolution–disaggregation mechanism

Rates and potential mechanism of anaerobic nitrate-dependent microbial pyrite oxidation

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