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- W2000456110 abstract "Uranium contamination of the environment from mining and milling operations, nuclear-waste disposal, and ammunition use is a widespread global problem. Natural attenuation processes such as bacterial reductive precipitation and immobilization of soluble uranium is gaining much attention. However, the presence of naturally occurring organic ligands can affect the precipitation of uranium. Here, we report that the anaerobic spore-forming bacteria Clostridia, ubiquitous in soils, sediments, and wastes, capable of reduction of Fe(III) to Fe(II), Mn(IV) to Mn(II), U(VI) to U(IV), Pu(IV) to Pu(III), and Tc(VI) to Tc(IV); reduced U(VI) associated with citric acid in a dinuclear 2:2 U(VI): citric acid complex to a biligand mononuclear 1:2 U(IV):citric acid complex,which remained in solution, in contrast to reduction and precipitation of uranium. Our findings show that U(VI) complexed with citric acid is readily accessible as an electron acceptor despite the inability of the bacterium to metabolize the complexed organic ligand. Furthermore, it suggests that the presence of organic ligands at uranium-contaminated sites can affect the mobility of the actinide under both oxic and anoxic conditions by forming such soluble complexes." @default.
- W2000456110 created "2016-06-24" @default.
- W2000456110 creator A5028143993 @default.
- W2000456110 creator A5062026923 @default.
- W2000456110 date "2008-10-23" @default.
- W2000456110 modified "2023-09-23" @default.
- W2000456110 title "Bioreduction of Uranium(VI) Complexed with Citric Acid by <i>Clostridia</i> Affects Its Structure and Solubility" @default.
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- W2000456110 doi "https://doi.org/10.1021/es801045m" @default.
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