Biotic and Abiotic Reduction and Solubilization of Pu(IV)O^sub 2^.xH^sub 2^O^sub (am)^ as Affected by Anthraquinone-2,6-disulfonate (AQDS) and Ethylenediaminetetraacetate (EDTA)
This study measured reductive solubilization of plutonium(IV) hydrous oxide (...) with hydrogen (...) as electron donor, in the presence or absence of dissimilatory metal-reducing bacteria (DMRB), anthraquinone-2,6-disulfonate (AQDS), and ethylenediaminetetraacetate (EDTA). In PIPES buffer at pH 7 w...
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| Veröffentlicht in: | Environmental science & technology 2012-02, Vol.46 (4), p.2132 |
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| creator | Plymale, Andrew E Bailey, Vanessa L Fredrickson, James K Heald, Steve M Buck, Edgar C Shi, Liang Wang, Zheming Resch, Charles T Moore, Dean A Bolton, Harvey |
| description | This study measured reductive solubilization of plutonium(IV) hydrous oxide (...) with hydrogen (...) as electron donor, in the presence or absence of dissimilatory metal-reducing bacteria (DMRB), anthraquinone-2,6-disulfonate (AQDS), and ethylenediaminetetraacetate (EDTA). In PIPES buffer at pH 7 with excess ..., Shewanella oneidensis and Geobacter sulfurreducens both solubilized |
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In PIPES buffer at pH 7 with excess ..., Shewanella oneidensis and Geobacter sulfurreducens both solubilized <0.001% of 0.5 mM ... over 8 days, with or without AQDS. However, ... increased by an order of magnitude in some treatments, and increases in solubility were associated with production of ... The solid phase of these treatments contained ..., with more in the DMRB treatments compared with abiotic controls. In the presence of EDTA and AQDS, ... was completely solubilized by S. oneidensis and G. sulfurreducens in 24 h. Without AQDS, bioreductive solubilization was slower (22 days) and less extensive (83-94%). In the absence of DMRB, EDTA facilitated reductive solubilization of 89% (without AQDS) to 98% (with AQDS) of the added ... over 418 days. An in vitro assay demonstrated electron transfer to ... from the S. oneidensis outer-membrane c-type cytochrome MtrC. Our results (1) suggest that ... reductive solubilization may be important in reducing environments, especially in the presence of complexing ligands and electron shuttles, (2) highlight the environmental importance of polynuclear, colloidal Pu, (3) provide additional evidence that Pu(III)-EDTA is a more likely mobile form of Pu than Pu(IV)-EDTA, and (4) provide another example of outer-membrane cytochromes and electron-shuttling compounds facilitating bioreduction of insoluble electron acceptors in geologic environments. 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In PIPES buffer at pH 7 with excess ..., Shewanella oneidensis and Geobacter sulfurreducens both solubilized <0.001% of 0.5 mM ... over 8 days, with or without AQDS. However, ... increased by an order of magnitude in some treatments, and increases in solubility were associated with production of ... The solid phase of these treatments contained ..., with more in the DMRB treatments compared with abiotic controls. In the presence of EDTA and AQDS, ... was completely solubilized by S. oneidensis and G. sulfurreducens in 24 h. Without AQDS, bioreductive solubilization was slower (22 days) and less extensive (83-94%). In the absence of DMRB, EDTA facilitated reductive solubilization of 89% (without AQDS) to 98% (with AQDS) of the added ... over 418 days. An in vitro assay demonstrated electron transfer to ... from the S. oneidensis outer-membrane c-type cytochrome MtrC. Our results (1) suggest that ... reductive solubilization may be important in reducing environments, especially in the presence of complexing ligands and electron shuttles, (2) highlight the environmental importance of polynuclear, colloidal Pu, (3) provide additional evidence that Pu(III)-EDTA is a more likely mobile form of Pu than Pu(IV)-EDTA, and (4) provide another example of outer-membrane cytochromes and electron-shuttling compounds facilitating bioreduction of insoluble electron acceptors in geologic environments. 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In PIPES buffer at pH 7 with excess ..., Shewanella oneidensis and Geobacter sulfurreducens both solubilized <0.001% of 0.5 mM ... over 8 days, with or without AQDS. However, ... increased by an order of magnitude in some treatments, and increases in solubility were associated with production of ... The solid phase of these treatments contained ..., with more in the DMRB treatments compared with abiotic controls. In the presence of EDTA and AQDS, ... was completely solubilized by S. oneidensis and G. sulfurreducens in 24 h. Without AQDS, bioreductive solubilization was slower (22 days) and less extensive (83-94%). In the absence of DMRB, EDTA facilitated reductive solubilization of 89% (without AQDS) to 98% (with AQDS) of the added ... over 418 days. An in vitro assay demonstrated electron transfer to ... from the S. oneidensis outer-membrane c-type cytochrome MtrC. Our results (1) suggest that ... reductive solubilization may be important in reducing environments, especially in the presence of complexing ligands and electron shuttles, (2) highlight the environmental importance of polynuclear, colloidal Pu, (3) provide additional evidence that Pu(III)-EDTA is a more likely mobile form of Pu than Pu(IV)-EDTA, and (4) provide another example of outer-membrane cytochromes and electron-shuttling compounds facilitating bioreduction of insoluble electron acceptors in geologic environments. (ProQuest: ... denotes formulae/symbols omitted.)</abstract><cop>Easton</cop><pub>American Chemical Society</pub></addata></record> |
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| ispartof | Environmental science & technology, 2012-02, Vol.46 (4), p.2132 |
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| language | eng |
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| source | American Chemical Society Journals |
| subjects | Bacteria Chemical compounds Electron transfer Membranes Molecules |
| title | Biotic and Abiotic Reduction and Solubilization of Pu(IV)O^sub 2^.xH^sub 2^O^sub (am)^ as Affected by Anthraquinone-2,6-disulfonate (AQDS) and Ethylenediaminetetraacetate (EDTA) |
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