Influence of Mn oxides on the reduction of uranium(VI) by the metal-reducing bacterium Shewanella putrefaciens

Fredrickson, James K.; Zachara, John M.; Kennedy, David W.; Liu, Chongxuan; Duff, Martine C.; Hunter, Douglas B.; Dohnálková, Alice

doi:10.1016/s0016-7037(02)00928-6

Cited by 173 publications

(143 citation statements)

References 69 publications

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“…Manganese oxides are also relatively strong oxidants and can oxidize insoluble, reduced contaminants such as the mineral uraniniteðUO 2 Þ ðsÞ , a common product of microbial uranium reduction . Fredrickson et al (2002) Liu et al 2002). The oxidation of biogenic UO 2(s) coupled with b-MnO 2(s) reduction is well-described by an electrochemical model .…”

Section: Transport and Redox Reactionsmentioning

confidence: 99%

“…The presence of Mn(III/IV) oxides has been shown to impede the formation of Fe(II) by dissimilatory metal reducing bacteria (DMRB) (Myers & Nealson 1988), probably via the rapid oxidation of biogenic Fe(II) (Myers & Nealson 1988). Although the extent to which Mn(III/IV) and Fe(III) oxides may jointly affect the in situ microbial reduction of U(VI) is unknown, it is clear that metal reduction and mineral precipitation processes at the cellular level as described by Fredrickson et al (2002) and Liu et al (2002) can have an important role.…”

Section: Transport and Redox Reactionsmentioning

confidence: 99%

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Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Hullebusch

Lens

Tabak

2005

Rev Environ Sci Biotechnol

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The biotransformation of metals is an exciting, developing strategy to treat metal contamination, especially in environments that are not accessible to other remediation technologies. However, our ability to benefit from these strategies hinges on our ability to monitor these transformations in the environment. That's why remediation of contaminated sediments and soil requires detailed in situ characterization of the speciation of the toxic substances and their transformations with respect to time and spatial distribution. The present paper gives an overview of the literature regarding research performed in the laboratory as well as in the field.

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Section: Transport and Redox Reactionsmentioning

confidence: 99%

Section: Transport and Redox Reactionsmentioning

confidence: 99%

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Hullebusch

Lens

Tabak

2005

Rev Environ Sci Biotechnol

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“…Also listed in Table 3 Although we demonstrated that U(IV) reoxidation became thermodynamically favorable in these reducing soils, the TEA(s) have not been identified. and Mn(IV) oxides to oxidize U(IV) in the presence of electron shuttles has been shown 27,28 , and soluble Fe(III) has been found in the pore waters of reduced sedimentary material containing crystalline and/or amorphous Fe-oxides 29 .…”

mentioning

confidence: 99%

Reoxidation of Bioreduced Uranium under Reducing Conditions

Wan

Tokunaga

Brodie

et al. 2005

Environ. Sci. Technol.

165

185

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“…The abiological oxidation of U(IV) is coupled to the reduction of O 2 , Fe(III), and Mn(IV) (Langmuir, 1978;Nevin and Lovley, 2000;Wielinga et al, 2000;Fredrickson et al, 2002;Liu et al, 2002). These inorganic reactions are kinetically fast and proceed without any surface catalysts.…”

Section: Abiological Processes That Control U Redox Transformationsmentioning

confidence: 99%

Geomicrobiological factors that control uranium mobility in the environment: Update on recent advances in the bioremediation of uranium-contaminated sites

Suzuki

Suko

2006

Journal of Mineralogical and Petrological Sciences

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Understanding the behavior of uranium (U) in the environment is essential not only for the protection of aquifers from U contamination but also for predicting the fate of U and other actinides disposed of in deep geological settings. It has long been believed that the redox chemistry of U can be simply predicted by thermodynamics and that the development of a low redox potential is a sufficient condition for U reduction. However, recent studies have demonstrated that redox transformations of U are controlled by kinetic factors that are strongly influenced by microbial activity. Although abiological U oxidation proceeds efficiently under oxygenic conditions, abiological reduction of U is inhibited by the formation of negatively charged U(VI) CO 3 complexes that prevail in nature. Phylogenetically diverse microorganisms are capable of enzymatically reducing U(VI) CO 3 complexes to form U(IV) bearing minerals such as uraninite (UO 2+x ). The only abiological pathway currently known for the reduction of U(VI) CO 3 complexes involves the Fe(II) monohydroxo surface complex Fe III OFe II OH 0 . This complex is mainly produced by the microbial reduction of Fe(III) in natural systems. Thus, U(VI) reduction is controlled both directly and indirectly, at least in part, by microbial activity. Several mechanisms of U oxidation under anoxic conditions have been revealed recently by laboratory and field studies. U(IV) is abiologically oxidized by Fe(III) and Mn(IV) oxides. Microbial reduction of nitrate to molecular nitrogen, which occurs following the depletion of O 2 , produces nitrogen intermediates including nitrite (NO 2 -), nitrous oxide (NO), and nitric oxide (N 2 O). Although the nitrogen intermediates oxidize U(IV), poorly crystalline Fe(III) oxide minerals resulting from the oxidation of aqueous Fe(II) species by the nitrogen intermediates oxidize U(IV) more efficiently than the nitrogen intermediates alone. Remarkably, the formation of Ca U(VI) CO 3 complexes resulting from increased levels of Ca 2+ and/or HCO 3 -leads to the reoxidation of bioreduced U(IV) under reducing conditions. These geomicrobiological factors pose challenges in manipulating and/or predicting the mobility and fate of U in complex and heterogeneous environmental settings.

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Influence of Mn oxides on the reduction of uranium(VI) by the metal-reducing bacterium Shewanella putrefaciens

Abstract: Influence of Mn oxides on the reduction of uranium(VI) by the Influence of Mn oxides on the reduction of uranium(VI) by the metal-reducing bacterium

Cited by 173 publications

References 69 publications

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Reoxidation of Bioreduced Uranium under Reducing Conditions

Geomicrobiological factors that control uranium mobility in the environment: Update on recent advances in the bioremediation of uranium-contaminated sites

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