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Biogenic Mineral Formation by Iron Reducing Bacteria

Published online by Cambridge University Press:  02 July 2020

Alice C. Dohnalkova ,
Yuri A. Gorby ,
Jeff McLean ,
Jim K. Fredrickson  and
David W. Kennedy
Alice C. Dohnalkova
Affiliation:
Pacific Northwest National Laboratory, Department of Environmental Microbiology, MS P7-50, Richland, WA, 99352
Yuri A. Gorby
Affiliation:
Pacific Northwest National Laboratory, Department of Environmental Microbiology, MS P7-50, Richland, WA, 99352
Jeff McLean
Affiliation:
Pacific Northwest National Laboratory, Department of Environmental Microbiology, MS P7-50, Richland, WA, 99352
Jim K. Fredrickson
Affiliation:
Pacific Northwest National Laboratory, Department of Environmental Microbiology, MS P7-50, Richland, WA, 99352
David W. Kennedy
Affiliation:
Pacific Northwest National Laboratory, Department of Environmental Microbiology, MS P7-50, Richland, WA, 99352
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Abstract

Dissimilatory iron reducing bacteria have been extensively studied for their ability to reduce ferric iron Fe(III) to ferrous iron Fe(II), as well as several multivalent heavy metals and radionuclides as a mode of energy-yielding respiration. Shewanella putrefaciens strain CN32 was used to investigate the mechanism of biogenic metal reduction in systems simulating conditions of natural anaerobic iron reducing environments in the subsurface contaminated with U and Tc as a possible strategy for bioremediation of soils containing these contaminants. As previously reviewed, U(VI) is soluble in most groundwaters, while U(VI) generally precipitates as the insoluble mineral uraninite. Formation of bioreduced minerals can lead to immobilization of these contaminants in the subsurface, which might be a very useful strategy for in situ bioremediation.

To determine the metal reduction and the formation of biogenic Fe(II), U(IV) and Tc(IV) minerals, experiments with CN32 exposed to well-defined aqueous solutions were conducted. Metal reduction was measured with time, and the resulting solids were analyzed by X-ray diffraction, scanning electron microscopy (SEM) and energydispersive X-ray spectroscopy (EDS).

Type
Microbiology
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 756 - 757
Copyright
Copyright © Microscopy Society of America 2001

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References

References:

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5.)This research was conducted in the Environmental Molecular Sciences Laboratory (EMSL), a national scientific user facility sponsored by the Department of Energy’s Office of Biological and Environmental Research, located at Pacific Northwest National Laboratory in Richland, WA.Google Scholar