Journal ArticleDOI
Zinc and Manganese Inhibition of Biological Hematite Reduction
TLDR
In this paper, the effects of zinc and manganese on the reductive dissolution of hematite by the dissimilatory metal-reducing bacterium (DMRB) Shewanella putrefaciens CN32 were studied in batch culture.Abstract:
The effects of zinc and manganese on the reductive dissolution of hematite by the dissimilatory metal-reducing bacterium (DMRB) Shewanella putrefaciens CN32 were studied in batch culture. Experiments were conducted with hematite (2.0 g L–1) in 10 mM PIPES (pH 6.8), and H2 as the electron donor under nongrowth conditions (108 cell mL–1), spiked with zinc (0.02–0.23 mM) or manganese (0.02–1.8 mM) and incubated for 5 days. Zinc inhibition was calculated based on the 5-day extent of hematite bioreduction in the absence and presence of zinc. Zinc inhibition of hematite bioreduction increased with anthraquinone- 2,6-disulfonate (AQDS), a soluble electron shuttling agent, and ferrozine, a strong Fe(II) complexant. Both amendments would otherwise stimulate hematite bioreduction. These amendments did not significantly increase zinc sorption, but may have increased zinc toxicity by some unknown mechanism. At equal total Me(II) concentrations, zinc inhibited hematite reduction more than manganese and caused greater ...read more
Citations
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Journal ArticleDOI
Arsenic Biotransformation in Solid Waste Residue: Comparison of Contributions from Bacteria with Arsenate and Iron Reducing Pathways
TL;DR: The results suggest that the arsC gene carriers mainly control the As speciation in the aqueous phase in aerobic environments, whereas in anaerobic conditions, the As Speciation should be regulated by arrA gene carriers, and As mobility is greatly enhanced by iron reduction.
Phosphate interactions with iron (hydr)oxides: Mineralization pathways and phosphorus retention upon bioreduction
TL;DR: In this article, the authors explore phosphate retention and transport upon bioreduction of ferrihydrite and to determine the resulting changes in both aqueous and solid phase constituents.
Book ChapterDOI
Chapter 12 Phosphate Interactions with Iron (Hydr)oxides: Mineralization Pathways and Phosphorus Retention upon Bioreduction
Thomas Borch,Scott Fendorf +1 more
TL;DR: In this article, the authors explore phosphate retention and transport upon bioreduction of ferrihydrite and to determine the resulting changes in both aqueous and solid phase constituents.
Measurement of iron(III) bioavailability in pure iron oxide minerals and soils using anthraquinone-2,6-disulfonic acid oxidation
TL;DR: The quinol form (AHDS) of 9,10-anthraquinone-2,6-disulfonate (AQDS) was used as a titrant to determine bioavailability of Fe(III) in pure iron minerals and several soils.
Journal ArticleDOI
Desorption and dissolution of heavy metals from contaminated soil using Shewanella sp. (HN-41) amended with various carbon sources and synthetic soil organic matters.
TL;DR: A combined system of humic acid and ADQS incorporated with glucose was found to be effective for the removal of heavy metals from soil.
References
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Journal ArticleDOI
Ferrozine---a new spectrophotometric reagent for iron
TL;DR: The ferroin group has been known to react as bidentate ligands with certain metal ions such as ferrous, cuprous, and cobaltous, to give colored complex species.
Journal ArticleDOI
Humic substances as electron acceptors for microbial respiration
Derek R. Lovley,John D. Coates,Elizabeth L. Blunt-Harris,Elizabeth J. P. Phillips,Joan C. Woodward,Joan C. Woodward +5 more
TL;DR: In this article, it was shown that some microorganisms found in soils and sediments are able to use humic substances as an electron acceptor for the anaerobic oxidation of organic compounds and hydrogen.
Journal ArticleDOI
Effects of heavy metals in soil on microbial processes and populations (a review)
TL;DR: In this article, the effects of Cd, Cu, Zn, and Pb on soil microorganisms and microbially mediated soil processes are reviewed, and the sensitivity of different measurements is discussed, and data compiled to compare relative toxicity of different metals.
Journal ArticleDOI
Biogenic iron mineralization accompanying the dissimilatory reduction of hydrous ferric oxide by a groundwater bacterium
James K. Fredrickson,John M. Zachara,David W. Kennedy,Hailang Dong,Tullis C. Onstott,Nancy W. Hinman,Shu Mei Li +6 more
TL;DR: In this paper, a batch of experiments were conducted with amorphous hydrous ferric oxide (HFO) and the DIRB Shewanella putrefaciens, strain CN32, in well-defined aqueous solutions to investigate the reduction of HFO and formation of biogenic Fe(II) minerals.
Journal ArticleDOI
A chemical equilibrium model for metal adsorption onto bacterial surfaces
TL;DR: In this paper, the authors quantified metal adsorption onto cell wall surfaces of Bacillus subtilis by applying equilibrium thermodynamics to the specific chemical reactions that occur at the water-bacteria interface.