The effects of aqueous bicarbonate and calcium ions on uranium biosorption by Arthrobacter G975 strain

Carvajal, Denny A.; Katsenovich, Yelena P.; Lagos, Leonel E.

doi:10.1016/j.chemgeo.2012.08.018

The effects of aqueous bicarbonate and calcium ions on uranium biosorption by Arthrobacter G975 strain

Journal Article · Mon Aug 27 04:00:00 EDT 2012 · Chemical Geology

DOI:https://doi.org/10.1016/j.chemgeo.2012.08.018· OSTI ID:1086701

Carvajal, Denny A. ^[1]; Katsenovich, Yelena P.; Lagos, Leonel E.

Applied Research Center, Florida International University, Miami, FL

Uranium(VI) biosorptionwas investigated using carbonate-free and carbonate amended synthetic groundwater (SGW) under conditions relevant to Ca-rich carbonate-bearing subsurface environments. SGW was amended with bicarbonate concentrations ranging between 0.5 and 5 mM and a G975 Arthrobacter oxydans strain, a soil bacterium previously isolated from Hanford Site soil. Selected treatments were amended with 5 mMof calcium to evaluate its effect on U(VI) biosorption. The study confirmed that Arthrobacter sp. G975 can effectively remove soluble U(VI) ions from aqueous solution. The Langmuir, Linear, and Freundlich isotherms were fitted to the experimental data. Based on a higher correlation coefficient, the data was better fit by the Langmuir model. The presence of calciumand bicarbonate ions in SGWaffects the sorption behavior of U(VI) due to the formation of highly soluble and stable uranyl-carbonate and calciumuranyl carbonate complexes that reduce adsorption of U(VI). Increasing aqueous bicarbonate concentrations exponentially reduced the U(VI) microbial adsorption compared to values obtained in carbonate-free solutions. The differences in U(VI) uptake generated by calcium additions in bicarbonate-free solutionswere small enough to conclude that calciumwas not a governing factor in biosorption. Results suggest that in the presence of bicarbonate and calcium, the damage to bacterial cells caused by U(VI) toxicity was reduced, yielding similar values for TOC degradation and cell density compared to U(VI)-free controls.

Research Organization:: Florida International Univ. (FIU), Miami, FL (United States)

Sponsoring Organization:: USDOE Office of Environmental Management (EM)

DOE Contract Number:: EM0000598

OSTI ID:: 1086701

Report Number(s):: DOE/EM0000598/FIU-ARC-2012-800000438-12c-213

Journal Information:: Chemical Geology, Journal Name: Chemical Geology Vol. 330-331; ISSN 0009-2541

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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42 ENGINEERING
54 ENVIRONMENTAL SCIENCES
Aqueous bicarbonate
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Biosorption
Calcium
Radionuclides

The effects of aqueous bicarbonate and calcium ions on uranium biosorption by Arthrobacter G975 strain

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