September 22, 2019  |  

Characterization of the antimonite- and arsenite-oxidizing bacterium Bosea sp. AS-1 and its potential application in arsenic removal.

Authors: Lu, Xiaolu and Zhang, Yining and Liu, Chaoyang and Wu, Mengxiaojun and Wang, Hongmei

Arsenic (As) and antinomy (Sb) usually coexist in natural environments where both of them pollute soils and water. Microorganisms that oxidize arsenite [As(III)] and tolerate Sb have great potential in As and Sb bioremediation, In this study, a Gram-negative bacterial strain, Bosea sp. AS-1, was isolated from a mine slag sample collected in Xikuangshan Sb mine in China. AS-1 could tolerate 120?mM of As(III) and 50?mM of antimonite [Sb(III)]. It could also oxidize 2?mM of As(III) or Sb(III) completely under heterotrophic and aerobic conditions. Interestingly, strain AS-1 preferred to oxidize As(III) with yeast extract as the carbon source, whereas Sb(III) oxidation was favored with lactate in the medium. Genomic analysis of AS-1 confirmed the presence of several gene islands for As resistance and oxidation. Notably, a system of AS-1 and goethite was found to be able to remove 99% of the As with the initial concentration of 500?µg/L As(III) and 500?µg/L Sb(III), which suggests the potential of this approach for As removal in environments especially with the presence of high Sb. Copyright © 2018 Elsevier B.V. All rights reserved.

Journal: Journal of hazardous materials
DOI: 10.1016/j.jhazmat.2018.07.112
Year: 2018

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