Subsurface interactions of actinide species and microorganisms : implications for the bioremediation of actinide-organic mixtures.

Banaszak, James E.; Reed, Donald T.; Rittmann, Bruce E.

doi:10.2172/12002

Cited by 12 publications

(19 citation statements)

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“…Microorganisms are able to impact upon radionuclide mobility via a range of mechanisms but discussing all these processes is beyond the scope of this review. The reader is referred to other reviews dealing with some of these aspects (Macaskie 1991;Banaszak et al 1999;Lloyd and Macaskie 2000;Macaskie and Lloyd, 2002;Gadd 2005).…”

Section: Introductionmentioning

confidence: 99%

The Impact of Fe(III)-reducing Bacteria on Uranium Mobility

et al. 2006

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The ability of specialist prokaryotes to couple the oxidation of organic compounds to the reduction of Fe(III) is widespread in the subsurface. Here microbial Fe(III) reduction can have a great impact on sediment geochemistry, affecting the minerals in the subsurface, the cycling of organic compounds and the mobility of a wide range of toxic metals and radionuclides. The contamination of the environment with radioactive waste is a major concern worldwide, and this review focuses on the mechanisms by which Fe(III)-reducing bacteria can affect the solubility and mobility of one of the most common radionuclide contaminants in the subsurface, uranium. In addition to discussing how these processes underpin natural biogeochemical cycles, we also discuss how these microbial activities can be harnessed for the bioremediation of uranium-contaminated environments.

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Section: Introductionmentioning

confidence: 99%

The Impact of Fe(III)-reducing Bacteria on Uranium Mobility

et al. 2006

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“…The presence of citrate in the input solution can increase Am mobility, mainly by direct aqueous complexation or by desorbing Am through calcite and iron oxides dissolution (Jones et al, 1996;Banaszak et al, 1998). The effect of citrate on the dissolution of the solid matrix is both direct (e.g.…”

Section: Am Concentrations In Column Eluatesmentioning

confidence: 99%

“…The soil buffering capacity was likely the process involved as calcite dissolution could limit citrate acidity. Moreover, citrate free ion concentration was probably lowered due to adsorption on the solid phase and biodegradation by soil microorganisms (Banaszak et al, 1998;Stro¨m et al, 2001). Low calcite and iron oxides dissolution/precipitation reactions occurred inside columns as no additional Ca and Fe releases were observed in eluates as well as no significative change in the solution pH.…”

Section: Am Concentrations In Column Eluatesmentioning

confidence: 99%

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Am-241 remobilization in a calcareous soil under simplified rhizospheric conditions studied by column experiments

Perrier

Martin-Garin

Morello

2005

Journal of Environmental Radioactivity

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“…For actinides (An) in general, lower oxidation states-An(III) and An(IV)-are less soluble and are more likely to precipitate than are the higher oxidation states. For plutonium, Pu(IV) and Pu(III) oxidation states exhibit lower solubility and, thus, are the target oxidation states (Banaszak et al 1999;Francis 2007;Reed et al 2010).…”

Section: Introductionmentioning

confidence: 99%

A biogeochemical framework for bioremediation of plutonium(V) in the subsurface environment

Deo

Rittmann

2012

Biodegradation

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Accidental release of plutonium (Pu) from storage facilities in the subsurface environment is a concern for the safety of human beings and the environment. Given the complexity of the subsurface environment and multivalent state of Pu, we developed a quantitative biogeochemical framework for bioremediation of Pu(V)O(2) (+) in the subsurface environment. We implemented the framework in the biogeochemical model CCBATCH by expanding its chemical equilibrium for aqueous complexation of Pu and its biological sub-models for including Pu's toxicity and reduction reactions. The quantified framework reveals that most of the Pu(V) is speciated as free Pu(V)O(2) (+) ((aq)), which is a problem if the concentration of free Pu(V)O(2) (+) is ≥28 μM (the half-maximum toxicity value for bacteria able to reduce Pu(V) to Pu(III)PO(4(am))) or ≥250 μM (the full-toxicity value that takes the bioreduction rate to zero). The framework includes bioreduction of Fe(3+) to Fe(2+), which abiotically reduces Pu(V)O(2) (+) to Pu(IV) and then to Pu(III). Biotic (enzymatic) reduction of Pu(V)O(2) (+) directly to Pu(III) by Shewanella alga (S. alga) is also included in the framework. Modeling results also reveal that for formation of Pu(III)PO(4(am)), the desired immobile product, the concentration of coexisting model strong ligand-nitrilotriacetic acid (NTA)-should be less than or equal to the concentration of total Pu(III).

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Subsurface interactions of actinide species and microorganisms : implications for the bioremediation of actinide-organic mixtures.

Cited by 12 publications

References 0 publications

The Impact of Fe(III)-reducing Bacteria on Uranium Mobility

The Impact of Fe(III)-reducing Bacteria on Uranium Mobility

Am-241 remobilization in a calcareous soil under simplified rhizospheric conditions studied by column experiments

A biogeochemical framework for bioremediation of plutonium(V) in the subsurface environment

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