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Dissimilatory bioreduction of iron(III) oxides by Shewanella loihica under marine sediment conditions

Benaiges-Fernandez, Robert (författare)
Department of Genetics, Microbiology and Statistics, Universitat de Barcelona, Barcelona, Catalonia, Spain. Institute of Environmental Assessment and Water Research (IDAEA, CSIC), Barcelona, Catalonia, Spain
Palau, Jordi (författare)
Institute of Environmental Assessment and Water Research (IDAEA, CSIC), Barcelona, Catalonia, Spain. Department of Mineralogy, Petrology and Applied Geology, Universitat de Barcelona, Barcelona, Catalonia, Spain
Offeddu, Francesco G. (författare)
Institute of Environmental Assessment and Water Research (IDAEA, CSIC), Barcelona, Catalonia, Spain
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Cama, Jordi (författare)
Institute of Environmental Assessment and Water Research (IDAEA, CSIC), Barcelona, Catalonia, Spain
Urmeneta, Jordi (författare)
Department of Genetics, Microbiology and Statistics, Universitat de Barcelona, Barcelona, Catalonia, Spain. Biodiversity Research Institute (IRBio), Universitat de Barcelona, Barcelona, Catalonia, Spain
Soler, Josep M. (författare)
Institute of Environmental Assessment and Water Research (IDAEA, CSIC), Barcelona, Catalonia, Spain
Dold, Bernhard (författare)
Luleå tekniska universitet,Geovetenskap och miljöteknik,Sustainable Mining Research & Consultancy EIRL, San Pedro de La Paz, Chile
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Department of Genetics, Microbiology and Statistics, Universitat de Barcelona, Barcelona, Catalonia, Spain Institute of Environmental Assessment and Water Research (IDAEA, CSIC), Barcelona, Catalonia, Spain Institute of Environmental Assessment and Water Research (IDAEA, CSIC), Barcelona, Catalonia, Spain. Department of Mineralogy, Petrology and Applied Geology, Universitat de Barcelona, Barcelona, Catalonia, Spain (creator_code:org_t)
Elsevier, 2019
2019
Engelska.
Ingår i: Marine Environmental Research. - : Elsevier. - 0141-1136 .- 1879-0291. ; 151
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • Shewanella is a genus of marine bacteria capable of dissimilatory iron reduction (DIR). In the context of deep-sea mining activities or submarine mine tailings disposal, dissimilatory iron reducing bacteria may play an important role in biogeochemical reactions concerning iron oxides placed on the sea bed. In this study, batch experiments were performed to evaluate the capacity of Shewanella loihica PV-4 to bioreduce different iron oxides (ferrihydrite, magnetite, goethite and hematite) under conditions similar to those in anaerobic sea sediments. Results showed that bioreduction of structural Fe(III) via oxidation of labile organic matter occurred in all these iron oxides. Based on the aqueous Fe (II) released, derived Fe(II)/acetate ratios and bioreduction coefficients seem to be only up to about 4% of the theoretical ones, considering the ideal stoichiometry of the reaction. A loss of aqueous Fe (II) was caused by adsorption and mineral transformation processes. Scanning electron microscope images showed that Shewanella lohica was attached to the Fe(III)-oxide surfaces during bioreduction. Our findings suggest that DIR of Fe(III) oxides from mine waste placed in marine environments could result in adverse ecological impacts such as liberation of trace metals in the environment.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)

Nyckelord

Iron bioreduction
Marine sediment
Iron oxide
Dissolution
Shewanella loihica
Applied Geochemistry
Tillämpad geokemi

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