Effect of Shewanella oneidensis on the Kinetics of Fe(II)-Catalyzed Transformation of Ferrihydrite to Crystalline Iron Oxides
- 20 December 2017
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 52 (1), 114-123
- https://doi.org/10.1021/acs.est.7b05098
Abstract
Iron (oxyhydr)oxides are widespread in natural and engineered systems, potent adsorbents of contaminants and a source of energy for iron-reducing bacteria. Microbial reduction of iron (oxyhydr)oxides results in the formation of Fe(II) which can induce the transformation of these iron minerals, typically from less crystalline to more crystalline forms, affecting the biogeochemical cycling of iron and the behaviour of any species adsorbed to the iron (oxyhydr)oxides. Factors influencing the transformation rate of the poorly crystalline iron (oxyhydr)oxide, ferrihydrite, to more crystalline forms in the presence of the iron reducing bacterium Shewanella oneidensis MR-1 are investigated under controlled laboratory conditions in this work. In particular, the amount of Fe(II) produced increased the transformation rate whilst increasing concentrations of the electron donor, lactate, decreased the rate. Using kinetic parameters determined from abiotic controls, the results of transformation experiments in the presence of Shewanella oneidensis were modeled with this exercise revealing that less goethite and more lepidocrocite formed than expected. Conversely, studies using the Shewanella exudate only, containing biogenic Fe(II), displayed rates of transformation that were satisfactorily modeled using these abiotic control kinetic parameters. This result suggests that the physical presence of the microbes is pivotal to the reduction in ferrihydrite transformation rate observed in the biotic experiments relative to the analogous abiotic controls.Keywords
Funding Information
- Australian Research Council (DE150100500, DP120103234)
- China Scholarship Council
This publication has 43 references indexed in Scilit:
- IRON IN MICROBIAL METABOLISMSElements, 2011
- Transport Implications Resulting from Internal Redistribution of Arsenic and Iron within Constructed Soil AggregatesEnvironmental Science & Technology, 2010
- Biogeochemical Redox Processes and their Impact on Contaminant DynamicsEnvironmental Science & Technology, 2009
- Spatial Patterns and Modeling of Reductive Ferrihydrite Transformation Observed in Artificial Soil AggregatesEnvironmental Science & Technology, 2009
- Shewanella secretes flavins that mediate extracellular electron transferProceedings of the National Academy of Sciences of the United States of America, 2008
- Secretion of Flavins by Shewanella Species and Their Role in Extracellular Electron TransferApplied and Environmental Microbiology, 2008
- Electron shuttling via humic acids in microbial iron(III) reduction in a freshwater sedimentFEMS Microbiology Ecology, 2004
- The Global Phosphorus CycleReviews in Mineralogy and Geochemistry, 2002
- Zinc Immobilization and Magnetite Formation via Ferric Oxide Reduction by Shewanella putrefaciens 200Environmental Science & Technology, 1999
- Microbial Reduction of Crystalline Iron(III) Oxides: Influence of Oxide Surface Area and Potential for Cell GrowthEnvironmental Science & Technology, 1996