Sorption and bioreduction of hexavalent uranium at a military facility by the Chesapeake Bay

Dong, Wenyi; Xie, Guibo; Miller, Todd R.; Franklin, Mark P.; Oxenberg, Tanya Palmateer; Bouwer, Edward J.; Ball, William P.; Halden, Rolf U.

doi:10.1016/j.envpol.2005.09.008

Cited by 40 publications

(28 citation statements)

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“…With their widespread occurrence in soils, sediments, and low-level radioactive wastes, clostridia could play a significant role in the in situ reduction of uranium and other metals, particularly at acidic pHs and in nitrate-rich environments (1,2,7,8,11,13). We found that all of the clostridia tested not only reduced uranium but differed in extent of reduction and that the pH of the medium strongly influences the reduction.…”

Section: Tion Of U(vi) (M Hmentioning

confidence: 81%

“…(ATCC 53464) and Clostridium sphenoides (ATCC 19403) can reduce uranylnitrate, -acetate, and -citrate complexes as well as complexes of other metals, implying that the reduction of uranyl compounds is a general property of this genus (4)(5)(6). Apparently, Clostridium is one of major players in uranium reduction in situ in acidic (pH 4) uranium mine pit water (11,13), at a military facility near Chesapeake Bay, MD (1), and at the ORFRC at Oak Ridge, TN (8). In this study, we investigated the abilities of several strains of clostridia to reduce uranium(VI) under fermentative conditions, viz., the Clostridium sp.…”

mentioning

confidence: 99%

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Reduction of Uranium(VI) to Uranium(IV) by Clostridia

Gao

Francis

2008

Appl Environ Microbiol

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Section: Tion Of U(vi) (M Hmentioning

confidence: 81%

mentioning

confidence: 99%

Reduction of Uranium(VI) to Uranium(IV) by Clostridia

Gao

Francis

2008

Appl Environ Microbiol

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“…Environmental microbial community analyses have shown that Gram-positive bacteria are represented in several U(VI)-contaminated sites, suggesting the potential relevance of these strains in the remediation process (Chang et al, 2001;Suzuki et al, 2002, N'Guessan et al, 2008, Dong et al, 2006. Therefore, recent research has focused on the characterization of U(VI) reduction by Clostridium spp.…”

Section: Introductionmentioning

confidence: 99%

U(VI) reduction by spores of Clostridium acetobutylicum

Vecchia

Veeramani

Suvorova

et al. 2010

Research in Microbiology

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Vegetative cells of Clostridium acetobutylicum are known to reduce hexavalent uranium (U(VI)). We investigated the ability of spores of this organism to drive the same reaction. We found that spores were able to remove U(VI) from solution when H 2 was provided as an electron donor and to form a U(IV) precipitate. We tested several environmental conditions and found that spent vegetative cell growth medium was required for the process. Electron microscopy showed the product of reduction to accumulate outside the exosporium. Our results point towards a novel U(VI) reduction mechanism, driven by spores, that is distinct from the thoroughly studied reactions in metal-reducing Proteobacteria.

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“…The majority of uranyl ions from the oxidative dissolution of UO 2 will strongly adsorb to ferric oxyhydroxides and organic matter in soils (Langmuir 1997); uranyl ions are rapidly removed from solution by association with organic matter (Dong et al 2006). Sequential extraction of firing range soils shows an association of DU with the oxidisable 'organic' fraction (Oliver et al 2008).…”

Section: Lloydmentioning

confidence: 99%

The distribution of depleted uranium contamination in Colonie, NY, USA

Lloyd

Chenery

Parrish

2009

Science of The Total Environment

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Uranium oxide particulates were dispersed into the environment from a factory in Colonie (NY, USA) by prevailing winds during the 1960's and '70's. Uranium concentration and isotope ratios from bulk soil samples have been accurately measured using inductively coupled plasma quadrupole mass spectrometry (ICP-QMS) without the need for analyte separation chemistry. The natural range of uranium concentrations in the Colonie soils has been estimated as 0.7 -2.1 µg g -1 , with a geometric mean of 1 µg g -1 ; the contaminated soil samples comprise uranium up to 500 ± 40 µg g -1. A plot of 236 U/ 238 U against 235 U/ 238 U isotopes ratios describes a mixing line between natural uranium and depleted uranium (DU) in bulk soil samples; scatter from this line can be accounted for by heterogeneity in the DU particulate. The end-member of DU compositions aggregated in these bulk samples comprises (2.05 ± 0.06) x10 -3 235 U/ 238 U, (3.2 ± 0.1) x10 -5 236 U/ 238 U, and (7.1 ± 0.3) x10 -6 234 U/ 238 U. The analytical method is sensitive to as little as 50 ng g -1 DU mixed with the natural uranium occurring in these soils. The contamination footprint has been mapped northward from site, and at least one third of the uranium in a soil sample from the surface 5 cm, collected 5.1 km NNW of the site, is DU. The distribution of contamination within the surface soil horizon follows a trend of exponential decrease with depth, which can be approximated by a simple diffusion model. Bioturbation by earthworms can account for dispersal of contaminant from the soil surface, in the form of primary uranium oxide particulates and uranyl species that are sorbed to organic matter. Considering this distribution, the total mass of uranium contamination emitted from the factory is estimated to be c. 4.8 tonnes.

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Sorption and bioreduction of hexavalent uranium at a military facility by the Chesapeake Bay

Cited by 40 publications

References 28 publications

Reduction of Uranium(VI) to Uranium(IV) by Clostridia

Reduction of Uranium(VI) to Uranium(IV) by Clostridia

U(VI) reduction by spores of Clostridium acetobutylicum

The distribution of depleted uranium contamination in Colonie, NY, USA

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