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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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The bacterial uranium(VI) reduction and its resultant low solubility make this process an attractive option for removing U from groundwater. An impact of aqueous suspending iron phase, which is redox sensitive and ubiquitous in subsurface groundwater, on the U(VI) bioreduction by Shewanella putrefaciens CN32 was investigated. In our batch experiment, the U(VI) concentration ($5{\times}10^5M$) gradually decreased to a non-detectable level during the microbial respiration. However, when Fe(III) phase was suspended in solution, bioreduction of U(VI) was significantly suppressed due to a preferred reduction of Fe(III) instead of U(VI). This shows that the suspending amorphous Fe(III) phase can be a strong inhibitor to the U(VI) bioreduction. On the contrary, when iron was present as a soluble Fe(II) in the solution, the U(VI) removal was largely enhanced. The microbially-catalyzed U(VI) reduction resulted in an accumulation of solid-type U particles in and around the cells. Electron elemental investigations for the precipitates show that some background cations such as Ca and P were favorably coprecipitated with U. This implies that aqueous U tends to be stabilized by complexing with Ca or P ions, which easily diffuse and coprecipitate with U in and around the microbial cell.
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참고문헌 (42)
참고문헌 신청
Abdelouas, A. / 1998 / Reduction of U(VI) to U(IV) by indigenous bacteria in contaminated ground water / J. Contamin. Hydrol 35:217~233
Bargar, J.R. / 2008 / Biogenic uraninite nanoparticles and their importance for uranium remediation / Elements 4:407~412
Bargar, J.R. / 2008 / Coupled biogeochemical processes governing the stability of bacteriogenic UO2: molecular to meter scales, 3rd Annual DOE-ERSP PI Meeting / Lansdowne
Beveridge, T.J. / 1989 / Role of cellular design in bacterial metal accumulation and mineralization / Ann. Rev. Microbiol 43:147~171
Bonneville, S. / 2004 / Microbial reduction of iron(III) oxyhydroxides: effects of mineral solubility and availability / Chem. Geol 212:255~268
Bargar, J.R. / 2008 / Biogenic uraninite nanoparticles and their importance for uranium remediation / Elements 4:407~412
Bargar, J.R. / 2008 / Coupled biogeochemical processes governing the stability of bacteriogenic UO2: molecular to meter scales, 3rd Annual DOE-ERSP PI Meeting / Lansdowne
Beveridge, T.J. / 1989 / Role of cellular design in bacterial metal accumulation and mineralization / Ann. Rev. Microbiol 43:147~171
Bonneville, S. / 2004 / Microbial reduction of iron(III) oxyhydroxides: effects of mineral solubility and availability / Chem. Geol 212:255~268
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