Fe(III), Cr(VI), and Fe(III) mediated Cr(VI) reduction in alkaline media using a <Emphasis Type="Italic">Halomonas</Emphasis> isolate from Soap Lake,Washington |
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Authors: | Michael?R?VanEngelen Email author" target="_blank">Brent?M?PeytonEmail author Melanie?R?Mormile Holly?C?Pinkart |
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Institution: | (1) Department of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA 99164-2710, USA;(2) Department of Chemical and Biological Engineering, Montana State University, Cobleigh 305, Bozeman, MT 59717-3920, USA;(3) Department of Biological Sciences, Missouri University of Science and Technology, Rolla, MO 65409-1120, USA;(4) Department of Biological Sciences, Central Washington University, Ellensburg, WA 98926-7537, USA |
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Abstract: | Hexavalent chromium is one of the most widely distributed environmental contaminants. Given the carcinogenic and mutagenic
consequences of Cr(VI) exposure, the release of Cr(VI) into the environment has long been a major concern. While many reports
of microbial Cr(VI) reduction are in circulation, very few have demonstrated Cr(VI) reduction under alkaline conditions. Since
Cr(VI) exhibits higher mobility in alkaline soils relative to pH neutral soils, and since Cr contamination of alkaline soils
is associated with a number of industrial activities, microbial Cr(VI) reduction under alkaline conditions requires attention.
Soda lakes are the most stable alkaline environments on earth, and contain a wide diversity of alkaliphilic organisms. In
this study, a bacterial isolate belonging to the Halomonas genus was obtained from Soap Lake, a chemically stratified alkaline lake located in central Washington State. The ability
of this isolate to reduce Cr(VI) and Fe(III) was assessed under alkaline (pH = 9), anoxic, non-growth conditions with acetate
as an electron donor. Metal reduction rates were quantified using Monod kinetics. In addition, Cr(VI) reduction experiments
were carried out in the presence of Fe(III) to evaluate the possible enhancement of Cr(VI) reduction rates through electron
shuttling mechanisms. While Fe(III) reduction rates were slow compared to previously reported rates, Cr(VI) reduction rates
fell within range of previously reported rates. |
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Keywords: | Alkaline Chromium Metal reduction Soap Lake Halomonas |
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