Science-based cleanup of Rocky Flats

Clark, David L.; Janecky, David R.; Lane, L. J.

doi:10.1063/1.2364243

Cited by 52 publications

(37 citation statements)

References 9 publications

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“…The possible reduction of Pu(IV) is of concern because Pu(IV) hydrous oxides, which represent the main fraction of Pu contaminants in the environment (8,9,17), could be mobilized by biological reduction to the more soluble Pu(III) oxidation state. A single previous study attempted to characterize the reduction of solid PuO 2 and subsequent solubilization of Pu(III) by Bacillus polymyxa and Bacillus circulans (28).…”

mentioning

confidence: 99%

Plutonium(IV) Reduction by the Metal-Reducing Bacteria Geobacter metallireducens GS15 and Shewanella oneidensis MR1

Boukhalfa

Icopini

Reilly

et al. 2007

Appl Environ Microbiol

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The bacterial reduction of actinides has been suggested as a possible remedial strategy for actinide-contaminated environments, and the bacterial reduction of Pu(VI/V) has the potential to produce highly insoluble Pu(IV) solid phases. However, the behavior of plutonium with regard to bacterial reduction is more complex than for other actinides because it is possible for Pu(IV) to be further reduced to Pu(III), which is relatively more soluble than Pu(IV). This work investigates the ability of the metal-reducing bacteria Geobacter metallireducens GS15 and Shewanella oneidensis MR1 to enzymatically reduce freshly precipitated amorphous Pu(IV) (OH)4 [Pu(IV)(OH)4(am)] and soluble Pu(IV)(EDTA). In cell suspensions without added complexing ligands, minor Pu(III) production was observed in cultures containing S. oneidensis, but little or no Pu(III) production was observed in cultures containing G. metallireducens. In the presence of EDTA, most of the Pu(IV)(OH)4(am) present was reduced to Pu(III) and remained soluble in cell suspensions of both S. oneidensis and G. metallireducens. When soluble Pu(IV)(EDTA) was provided as the terminal electron acceptor, cell suspensions of both S. oneidensis and G. metallireducens rapidly reduced Pu(IV)(EDTA) to Pu(III)(EDTA) with nearly complete reduction within 20 to 40 min, depending on the initial concentration. Neither bacterium was able to use Pu(IV) (in any of the forms used) as a terminal electron acceptor to support growth. These results have significant implications for the potential remediation of plutonium and suggest that strongly reducing environments where complexing ligands are present may produce soluble forms of reduced Pu species.

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mentioning

confidence: 99%

Plutonium(IV) Reduction by the Metal-Reducing Bacteria Geobacter metallireducens GS15 and Shewanella oneidensis MR1

Boukhalfa

Icopini

Reilly

et al. 2007

Appl Environ Microbiol

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“…Making the case for particle transport mechanisms as the basis of plutonium and americium mobility, rather than aqueous sorption-desorption processes, established a successful scientific basis for the dominance of physical transport processes by wind and water [7]. Conceptual models played a pivotal role and served as the platform for communicating the scientific understanding to stakeholder groups.…”

Section: Discussionmentioning

confidence: 99%

“…The detailed science that led to this recognition has been described elsewhere [7][8][9][10][11][12]. These particles and colloids can migrate in the Rocky Flats environment by wind and surface water resuspension and sedimentation processes.…”

Section: The Actinide Migration Evaluationmentioning

confidence: 99%

Rocky Flats closure: The role of models in facilitating scientific communication with stakeholder groups

Clark

Choppin

Dayton³

et al. 2007

Journal of Alloys and Compounds

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“…Colloidal transport through groundwater also was suggested as a possible process for Pu transport through groundwater at Rocky Flats (Harnish et al 1994). Later work indicates that this pathway is not likely to be significant at Rocky Flats, but rather wind driven re-suspension and hillside erosion were dominant transport mechanisms for Pu (Santschi et al 2002;Clark et al 2006). Pu migration at Maxey Flats is due primarily to increased solubility and reduced adsorption of Pu as a result of complexation with EDTA.…”

Section: Summary and Implications For Hanfordmentioning

confidence: 99%

Subsurface Behavior of Plutonium and Americium at Non-Hanford Sites and Relevance to Hanford

Cantrell¹,

Riley²

2008

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Science-based cleanup of Rocky Flats

Abstract: The chemical and physical interactions of radioactive compounds are key to understanding how they can contaminate the environment and, more importantly, how best to remove them.

Cited by 52 publications

References 9 publications

Plutonium(IV) Reduction by the Metal-Reducing Bacteria Geobacter metallireducens GS15 and Shewanella oneidensis MR1

Plutonium(IV) Reduction by the Metal-Reducing Bacteria Geobacter metallireducens GS15 and Shewanella oneidensis MR1

Rocky Flats closure: The role of models in facilitating scientific communication with stakeholder groups

Subsurface Behavior of Plutonium and Americium at Non-Hanford Sites and Relevance to Hanford

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