PMID: 15224730Jul 1, 2004Paper

Uranium complexes formed at hematite surfaces colonized by sulfate-reducing bacteria

Environmental Science & Technology
Andrew L NealGill G Geesey

Abstract

Modeling uranium (U) transport in subsurface environments requires a thorough knowledge of mechanisms likely to restrict its mobility, such as surface complexation, precipitation, and colloid formation. In closed systems, sulfate-reducing bacteria (SRB) such as Desulfovibrio spp. demonstrably affect U immobilization by enzymatic reduction of U(VI) species (primarily the uranyl ion, UO2(2+), and its complexes) to U(IV). However, our understanding of such interactions under chronic U(VI) exposure in dynamic systems is limited. As a first step to understanding such interactions, we performed bioreactor experiments under continuous flow to study the effect of a biofilm of the sulfate-reducing bacterium Desulfovibrio desulfuricans attached to specular hematite (alpha-Fe2O3) surfaces on surface-associated U(VI) complexation, transformation, and mobility. Employing real-time microscopic observation and X-ray photoelectron spectroscopy (XPS), we show that the characteristics of the U(VI) complex(es) formed at the hematite surface are influenced by the composition of the bulk aqueous phase flowing across the surface and bythe presence of surface-associated SRB. The XPS data further suggest higher levels of U associated with hematite sur...Continue Reading

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Citations

Jan 22, 2010·Analytical and Bioanalytical Chemistry·Thuro ArnoldNils Baumann
Jan 29, 2013·Environmental Science and Pollution Research International·Martin Mkandawire
May 27, 2005·Current Opinion in Biotechnology·Jonathan R Lloyd, Joanna C Renshaw
Nov 19, 2011·Biotechnology and Bioengineering·Sarah J VogtSarah L Codd
Apr 22, 2015·Journal of Hazardous Materials·Congcong DingXiangke Wang
Sep 21, 2011·Physical Chemistry Chemical Physics : PCCP·Mahesh SundararajanSwapan K Ghosh
Jan 15, 2009·Journal of Environmental Quality·Andrew S MaddenCraig C Brandt
Oct 24, 2009·Environmental Science & Technology·Peter S NicoScott Fendorf

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