Solubility and dissimilatory reduction kinetics of iron(III) oxyhydroxides: A linear free energy relationship

Bonneville, Steeve; Behrends, Thilo; Cappellen, Philippe Van

doi:10.1016/j.gca.2009.06.006

Cited by 160 publications

(124 citation statements)

References 51 publications

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“…The kinetics of microbial iron oxide reduction are influenced by many factors, including mineral surface area, the extent of particle aggregation, crystal structure, solubility, and the amount of usable energy available for microbial metabolism (26,62,68,85). In the present study, strain Z6 follows the general trend that less crystalline ferric iron minerals are more rapidly reduced and to a greater extent than the more crystalline iron oxides (Fig.…”

Section: Discussionsupporting

confidence: 54%

Orenia metallireducens sp. nov. Strain Z6, a Novel Metal-Reducing Member of the Phylum Firmicutes from the Deep Subsurface

Dong

Sanford

Boyanov

et al. 2016

Appl Environ Microbiol

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A novel halophilic and metal-reducing bacterium, Orenia metallireducens strain Z6, was isolated from briny groundwater extracted from a 2.02 km-deep borehole in the Illinois Basin, IL. This organism shared 96% 16S rRNA gene similarity with Orenia marismortui but demonstrated physiological properties previously unknown for this genus. In addition to exhibiting a fermentative metabolism typical of the genus Orenia, strain Z6 reduces various metal oxides [Fe(III), Mn(IV), Co(III), and Cr(VI)], using H 2 as the electron donor. Strain Z6 actively reduced ferrihydrite over broad ranges of pH (6 to 9.6), salinity (0.4 to 3.5 M NaCl), and temperature (20 to 60°C). At pH 6.5, strain Z6 also reduced more crystalline iron oxides, such as lepidocrocite (␥- IMPORTANCEA novel iron-reducing species, Orenia metallireducens sp. nov., strain Z6, was isolated from groundwater collected from a geological formation located 2.02 km below land surface in the Illinois Basin, USA. Phylogenetic, physiologic, and genomic analyses of strain Z6 found it to have unique properties for iron reducers, including (i) active microbial iron-reducing capacity under broad ranges of temperatures (20 to 60°C), pHs (6 to 9.6), and salinities (0.4 to 3.5 M NaCl), (ii) lack of c-type cytochromes typically affiliated with iron reduction in Geobacter and Shewanella species, and (iii) being the only member of the Halanaerobiales capable of reducing crystalline goethite and hematite. This study expands the scope of phylogenetic affiliations, metabolic capacities, and catalytic mechanisms for iron-reducing microbes.T he reduction of ferric [Fe(III)-bearing] minerals by microorganisms is widespread in both terrestrial and marine environments (1, 2) and is potentially one of the earliest forms of metabolism (3, 4). Due to the abundance of ferric minerals in the Earth's crust and the ubiquity of dissimilatory metal-reducing bacteria (DMRB), Fe(III) reduction is of global environmental significance, particularly in the subsurface. A phylogenetic variety of organisms has been reported for the capacity to reduce iron in a dissimilatory manner (1, 5). Dissimilatory iron reduction can be classified into two major groups. Many of the iron-reducing organisms (e.g., fermentative iron reducers) use Fe(III) as a minor side reaction in their metabolism but do not appear to conserve energy to support growth from this electron transfer. In comparison, the respiratory iron reducers conserve energy to support growth from Fe(III) via an electron transfer chain (1,5). DMRB strongly influence the biogeochemical cycling of metals and mineralization of organic matter in aquatic and sedimentary environments (1,(6)(7)(8). In addition, DMRB play a key role in the bioremediation of hazardous contaminants, such as heavy metals, radionuclides, and hydrocarbons (9). DMRB capable of reducing ferric minerals have previously been isolated from gold mines, petroleum reservoirs, and other

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Section: Discussionsupporting

confidence: 54%

Orenia metallireducens sp. nov. Strain Z6, a Novel Metal-Reducing Member of the Phylum Firmicutes from the Deep Subsurface

Dong

Sanford

Boyanov

et al. 2016

Appl Environ Microbiol

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“…7 and Table S2 in the Supplement). The down-core distributions of Fe PW and Mn PW were consistent with microbial dissimilatory Mn and Fe reduction during organic matter oxidation (Canfield and Thamdrup, 2009), and thus concentrations were elevated at defined depth horizons controlled by their redox potential (Eh) (Bonneville et al, 2009;Raiswell and Canfield, 2012). The Fe PW and Mn PW concentrations near the sediment-seawater interface were used to calculate fluxes of Fe and Mn to bottom waters following diffusion of reduced Fe and Mn species across an oxygenated layer in surface sediments.…”

Section: Supply From Sediment Pore Watersmentioning

confidence: 76%

Mechanisms of dissolved and labile particulate iron supply to shelf waters and phytoplankton blooms off South Georgia, Southern Ocean

et al. 2018

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Abstract. The island of South Georgia is situated in the iron (Fe)-depleted Antarctic Circumpolar Current of the Southern Ocean. Iron emanating from its shelf system fuels large phytoplankton blooms downstream of the island, but the actual supply mechanisms are unclear. To address this, we present an inventory of Fe, manganese (Mn), and aluminium (Al) in shelf sediments, pore waters, and the water column in the vicinity of South Georgia, alongside data on zooplankton-mediated Fe cycling processes, and provide estimates of the relative dissolved Fe (DFe) fluxes from these sources. Seafloor sediments, modified by authigenic Fe precipitation, were the main particulate Fe source to shelf bottom waters as indicated by the similar Fe / Mn and Fe / Al ratios for shelf sediments and suspended particles in the water column. Less than 1 % of the total particulate Fe pool was leachable surface-adsorbed (labile) Fe and therefore potentially available to organisms. Pore waters formed the primary DFe source to shelf bottom waters, supplying 0.1-44 µmol DFe m −2 d −1 . However, we estimate that only 0.41 ± 0.26 µmol DFe m −2 d −1 was transferred to the surface mixed layer by vertical diffusive and advective mixing. Other trace metal sources to surface waters included glacial flour released by melting glaciers and via zooplankton egestion and excretion processes. On average 6.5 ± 8.2 µmol m −2 d −1 of labile particulate Fe was supplied to the surface mixed layer via faecal pellets formed by Antarctic krill (Euphausia superba), with a further 1.1 ± 2.2 µmol DFe m −2 d −1 released directly by the krill. The faecal pellets released by krill included seafloor-derived lithogenic and authigenic material and settled algal debris, in addition to freshly ingested suspended phytoplankton cells.The Fe requirement of the phytoplankton blooms ∼ 1250 km downstream of South Georgia was estimated as 0.33 ± 0.11 µmol m −2 d −1 , with the DFe supply by horizontal/vertical mixing, deep winter mixing, and aeolian dust estimated as ∼ 0.12 µmol m −2 d −1 . We hypothesize that a sub-

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“…The dissolution kinetics and equilibrium solubilities of a large range of pure Fe(III) oxides and oxyhydroxide mineral phases have been measured experimentally (Cornell and Schwertmann, 2003;Bonneville et al, 2009). However, these datasets cannot be directly applied to global dust models because dust samples are usually composed of a variable mixture of Fe minerals that have a variety of sizes as well as mineralogical and chemical compositions (Shi et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Iron dissolution kinetics of mineral dust at low pH during simulated atmospheric processing

et al. 2011

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Solubility and dissimilatory reduction kinetics of iron(III) oxyhydroxides: A linear free energy relationship

Cited by 160 publications

References 51 publications

Orenia metallireducens sp. nov. Strain Z6, a Novel Metal-Reducing Member of the Phylum Firmicutes from the Deep Subsurface

Orenia metallireducens sp. nov. Strain Z6, a Novel Metal-Reducing Member of the Phylum Firmicutes from the Deep Subsurface

Mechanisms of dissolved and labile particulate iron supply to shelf waters and phytoplankton blooms off South Georgia, Southern Ocean

Iron dissolution kinetics of mineral dust at low pH during simulated atmospheric processing

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