Bacterial reduction of crystalline Fe (super 3+) oxides in single phase suspensions and subsurface materials
1998; Mineralogical Society of America; Volume: 83; Issue: 11-12 Part 2 Linguagem: Inglês
10.2138/am-1998-11-1232
ISSN1945-3027
AutoresJohn M. Zachara, James K. Fredrickson, Shu-Mei Li, David W. Kennedy, Steven C. Smith, Paul L. Gassman,
Tópico(s)Mine drainage and remediation techniques
ResumoOther| December 01, 1998 Bacterial reduction of crystalline Fe (super 3+) oxides in single phase suspensions and subsurface materials John M. Zachara; John M. Zachara Pacific Northwest National Laboratory, Richland, WA, United States Search for other works by this author on: GSW Google Scholar James K. Fredrickson; James K. Fredrickson Search for other works by this author on: GSW Google Scholar Shu-Mei Li; Shu-Mei Li Search for other works by this author on: GSW Google Scholar David W. Kennedy; David W. Kennedy Search for other works by this author on: GSW Google Scholar Steven C. Smith; Steven C. Smith Search for other works by this author on: GSW Google Scholar Paul L. Gassman Paul L. Gassman Search for other works by this author on: GSW Google Scholar Author and Article Information John M. Zachara Pacific Northwest National Laboratory, Richland, WA, United States James K. Fredrickson Shu-Mei Li David W. Kennedy Steven C. Smith Paul L. Gassman Publisher: Mineralogical Society of America First Online: 02 Mar 2017 Online ISSN: 1945-3027 Print ISSN: 0003-004X GeoRef, Copyright 2004, American Geological Institute. American Mineralogist (1998) 83 (11-12_Part_2): 1426–1443. https://doi.org/10.2138/am-1998-11-1232 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation John M. Zachara, James K. Fredrickson, Shu-Mei Li, David W. Kennedy, Steven C. Smith, Paul L. Gassman; Bacterial reduction of crystalline Fe (super 3+) oxides in single phase suspensions and subsurface materials. American Mineralogist 1998;; 83 (11-12_Part_2): 1426–1443. doi: https://doi.org/10.2138/am-1998-11-1232 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract Microbiologic reduction of synthetic and geologic Fe (super 3+) oxides associated with four Pleistocene-age, Atlantic coastal plain sediments was investigated using a dissimilatory Fe reducing bacterium (Shewanella putrefaciens, strain CN32) in bicarbonate buffer. Experiments investigated whether phosphate and anthraquinone-2, 6-disulfonate, (AQDS, a humic acid analogue) influenced the extent of crystalline Fe (super 3+) oxide bioreduction and whether crystalline Fe (super 3+) oxides in geologic materials are more or less reducible than comparable synthetic phases. Anaerobic incubations (10 8 organisms/mL) were performed both with and without PO 4 and AQDS that functions as an electron repository and shuttle. The production of Fe (super 2+) (solid and aqueous) was followed with time, as was mineralogy by X-ray diffraction. The synthetic oxides were reduced in a qualitative trend consistent with their surface area and free energy: hydrous ferric oxide (HFO)>goethite>hematite. Bacterial reduction of the crystalline oxides was incomplete in spite of excess electron donor. Biogenic formation of vivianite [Fe 3 (PO 4 ) 2 .8H 2 O] and siderite (FeCO 3 ) was observed; the conditions of their formation was consistent with their solubility. The geologic Fe (super 3+) oxides showed a large range in reducibility, approaching 100% in some materials. The natural oxides were equally or more reducible than their synthetic counterparts, in spite of association with non-reducible mineral phases (e.g., kaolinite). The reducibility of the synthetic and geologic oxides was weakly effected by PO 4 , but was accelerated by AQDS, CN32 produced the hydroquinone form of AQDS (AHDS), that, in turn, had thermodynamic power to reduce the Fe (super 3+) oxides. As a chemical reductant, it could reach physical regions of the oxide not accessible by the organism. Electron microscopy showed that crystallite size was not the primary factor that caused differences in reducibility between natural and synthetic crystalline Fe (super 3+) oxide phases. Crystalline disorder and microheterogeneities may be more important. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Referência(s)