Controls on Iron Reduction and Biomineralization over Broad Environmental Conditions as Suggested by the Firmicutes Orenia metallireducens Strain Z6
| Autor: | Bruce W. Fouke, Theodore M. Flynn, Maxim I. Boyanov, Yiran Dong, Samantha George, Robert A. Sanford, Dongmei Huang, Edward J. O'Loughlin, Shuzhen Li, Shuyi Li, Kenneth M. Kemner, Kaitlyn E. Fouke |
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| Rok vydání: | 2020 |
| Předmět: |
Goethite
Chemistry General Chemistry 010501 environmental sciences engineering.material Hematite Phosphate 01 natural sciences Mineralization (biology) chemistry.chemical_compound Ferrihydrite Environmental chemistry visual_art engineering visual_art.visual_art_medium Environmental Chemistry Lepidocrocite 0105 earth and related environmental sciences Magnetite Biomineralization |
| Zdroj: | Environmental Science & Technology. 54:10128-10140 |
| ISSN: | 1520-5851 0013-936X |
| Popis: | Microbial iron reduction is a ubiquitous biogeochemical process driven by diverse microorganisms in a variety of environments. However, it is often difficult to separate the biological from the geochemical controls on bioreduction of Fe(III) oxides. Here, we investigated the primary driving factor(s) that mediate secondary iron mineral formation over a broad range of environmental conditions using a single dissimilatory iron reducer, Orenia metallireducens strain Z6. A total of 17 distinct geochemical conditions were tested with differing pH (6.5-8.5), temperature (22-50 °C), salinity (2-20% NaCl), anions (phosphate and sulfate), electron shuttle (anthraquinone-2,6-disulfonate), and Fe(III) oxide mineralogy (ferrihydrite, lepidocrocite, goethite, hematite, and magnetite). The observed rates and extent of iron reduction differed significantly with kint between 0.186 and 1.702 mmol L-1 day-1 and Fe(II) production ranging from 6.3% to 83.7% of the initial Fe(III). Using X-ray absorption and scattering techniques (EXAFS and XRD), we identified and assessed the relationship between secondary minerals and the specific environmental conditions. It was inferred that the observed bifurcation of the mineralization pathways may be mediated by differing extents of Fe(II) sorption on the remaining Fe(III) minerals. These results expand our understanding of the controls on biomineralization during microbial iron reduction and aid the development of practical applications. |
| Databáze: | OpenAIRE |
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