Distribution of Chromium Contamination and Microbial Activity in Soil Aggregates

Tokunaga, Tetsu K.; Wan, Jiamin; Hazen, Terry C.; Schwartz, Egbert; Firestone, Mary K.; Sutton, S. R.; Newville, Matthew; Olson, Keith R.; Lanzirotti, Antonio; Rao, William

doi:10.2134/jeq2003.5410

Cited by 46 publications

(21 citation statements)

References 41 publications

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“…It should be noted that this Fe fraction capable of reoxidizing U is limited to amorphous Fe(III) and ferrihydrite, and that other common Fe(III) oxyhydroxides and oxides such as goethite and hematite are incapable of driving U-reoxidation (13,19). In a similar study, direct measurements of Fe oxidation states using X-ray absorption spectroscopy showed that 12% of the Fe(III) in this sediment was reduce up to 400 days (20). These results collectively indicate that only a small Fe(III) fraction is readily available for bioreduction and for U-reoxidation, and that a much larger Fe(III) fraction is gradually bioreduced over longer times (1400 days).…”

supporting

confidence: 52%

Effects of Organic Carbon Supply Rates on Uranium Mobility in a Previously Bioreduced Contaminated Sediment

Wan

Tokunaga

Kim

et al. 2008

Environ. Sci. Technol.

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supporting

confidence: 52%

Effects of Organic Carbon Supply Rates on Uranium Mobility in a Previously Bioreduced Contaminated Sediment

Wan

Tokunaga

Kim

et al. 2008

Environ. Sci. Technol.

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“…Although many bacterial strains are known to enhance reduction of Cr(VI) to Cr(III) both aerobically (17,18) and anaerobically (19)(20)(21)(22), only a few studies have examined the in situ potential of Cr(VI) microbial reduction in subsurface materials (e.g., [23][24][25]. Laboratory studies have also shown that Cr(VI) reduction in saturated soil aggregates under anaerobic conditions is mainly diffusion-rate-limited and can be strongly transport-controlled and localized (26,27).…”

Section: +mentioning

confidence: 99%

In Situ Long-Term Reductive Bioimmobilization of Cr(VI) in Groundwater Using Hydrogen Release Compound

Faybishenko

Hazen

Long

et al. 2008

Environ. Sci. Technol.

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“…Unlike Cr(III), Cr(VI) is acutely toxic, is soluble, and is not likely to coordinate with or adsorb to soil constituents (Tokunaga et al 2003;Fendorf et al 2000;Weng et al 2001). Cr(VI) therefore exhibits much greater environmental mobility, thus increasing its overall environmental threat (Bartlett and Kimble 1976b;Fendorf et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Fe(III), Cr(VI), and Fe(III) mediated Cr(VI) reduction in alkaline media using a Halomonas isolate from Soap Lake, Washington

et al. 2008

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Hexavalent chromium is one of the most widely distributed environmental contaminants. Given the carcinogenic and mutagenic consequences of Cr(VI) exposure, the release of Cr(VI) into the environment has long been a major concern. While many reports of microbial Cr(VI) reduction are in circulation, very few have demonstrated Cr(VI) reduction under alkaline conditions. Since Cr(VI) exhibits higher mobility in alkaline soils relative to pH neutral soils, and since Cr contamination of alkaline soils is associated with a number of industrial activities, microbial Cr(VI) reduction under alkaline conditions requires attention.Soda lakes are the most stable alkaline environments on earth, and contain a wide diversity of alkaliphilic organisms. In this study, a bacterial isolate belonging to the Halomonas genus was obtained from Soap Lake, a chemically stratified alkaline lake located in central Washington State. The ability of this isolate to reduce Cr(VI) and Fe(III) was assessed under alkaline (pH = 9), anoxic, non-growth conditions with acetate as an electron donor. Metal reduction rates were quantified using Monod kinetics. In addition, Cr(VI) reduction experiments were carried out in the presence of Fe(III) to evaluate the possible enhancement of Cr(VI) reduction rates through electron shuttling mechanisms. While Fe(III) reduction rates were slow compared to previously reported rates, Cr(VI) reduction rates fell within range of previously reported rates.

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Distribution of Chromium Contamination and Microbial Activity in Soil Aggregates

Abstract: ABSTRACTvariations in chemical (Wilcke and Kaupenjohann, 1998) and microbiological (Seech and Beauchamp, 1988; Dra- (Currie, 1961;Smith, 1977)

Cited by 46 publications

References 41 publications

Effects of Organic Carbon Supply Rates on Uranium Mobility in a Previously Bioreduced Contaminated Sediment

Effects of Organic Carbon Supply Rates on Uranium Mobility in a Previously Bioreduced Contaminated Sediment

In Situ Long-Term Reductive Bioimmobilization of Cr(VI) in Groundwater Using Hydrogen Release Compound

Fe(III), Cr(VI), and Fe(III) mediated Cr(VI) reduction in alkaline media using a Halomonas isolate from Soap Lake, Washington

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