Journal ArticleDOI
Surface catalysis of uranium(VI) reduction by iron(II)
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In this article, the authors investigated the kinetic effect of specific adsorption interactions on the chemical reduction of uranyl (UVIO22+) by ferrous iron, and derived a rate law for surface-catalyzed U(VI) reduction by Fe(II), d[U(VI)] dt =−k[≡ Fe III OFe II OH 0 ][U( VI)] ads where the bimolecular rate constant k has a value of 399 ± 25 M−1 min−1 at 25°C.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 1999-10-01. It has received 647 citations till now. The article focuses on the topics: Uranyl & Reaction rate constant.read more
Citations
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Fe(II)-mediated reduction and repartitioning of structurally incorporated Cu, Co, and Mn in iron oxides.
TL;DR: This work shows that redox-sensitive elements structurally incorporated within iron oxides are reduced and repartitioned into fluids during Fe(II)-mediated recrystallization of Cu-, Co-, and Mn-substituted goethite and hematite.
Journal ArticleDOI
Heterogeneous reduction of U6+ by structural Fe2+ from theory and experiment
TL;DR: In this article, the authors performed computational and experimental studies to explore heterogeneous reduction of U 6+ by structural Fe 2+ at magnetite (Fe 3 O 4 ) surfaces.
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The effect of pH and natural microbial phosphatase activity on the speciation of uranium in subsurface soils
TL;DR: In this paper, two uranium contaminated soils from the Department of Energy Oak Ridge Field Research Center (ORFRC) were amended with glycerol phosphate as model organophosphate source in small flow-through columns under aerobic conditions to determine whether natural phosphatase activity of indigenous soil bacteria was able to promote the precipitation of uranium(VI) at pH 5.5 and 7.0.
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New insights in the heterogeneous photocatalytic removal of U(VI) in aqueous solution in the presence of 2-propanol
TL;DR: In this article, the efficiency of heterogeneous photocatalysis with TiO 2 under UV light (HP) for the removal of uranyl ion from water (0.25mM, pH 3) in the presence of 2-propanol (2-PrOH) was evaluated.
Journal ArticleDOI
Uranium isotope fractionation by abiotic reductive precipitation.
Shaun T. Brown,Anirban Basu,Xin Ding,John N. Christensen,Donald J. DePaolo,Donald J. DePaolo +5 more
TL;DR: It is demonstrated that 238U/235U is fractionated by abiotic reduction onto the surface of abiotic synthetic iron monosulfide, contradicting the findings of earlier studies and means that abiotic U isotope fractionation likely occurs in any reducing environment with aqueous Ca ≥ 1 mM, and that the magnitude of isotopic fractionation changes in response to changes in aQueous major ion concentrations that affect U speciation.
References
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Book
Critical Stability Constants
TL;DR: Erratum to: Aminocarboxylic Acids to: Iminodiacetic Acid Derivatives to: Peptides to: Aliphatic Amines to: Protonation Values for other Ligands.
Book
Solutions, Minerals and Equilibria
Robert M. Garrels,C. L. Christ +1 more
TL;DR: In this article, the authors provide a thorough, up-to-date coverage of controls on the chemical quality of surface and ocean waters. But they do not provide a detailed analysis of the results of their experiments.
Book
Fourier Transform Infrared Spectrometry
TL;DR: The theory and instrumentation for Fourier transform infrared spectrometry are discussed, and important areas of chemistry include atmospheric monitoring, surface chemistry, and on-line identification of chromatographically separated materials.
Book
Vogel's textbook of quantitative chemical analysis
TL;DR: In this paper, the principles of reaction in solution are discussed and the basis of separarative methods are discussed, as well as the safety units of Reagent Purity and Reagent Reactions in Solution.
Journal ArticleDOI
Uranium solution-mineral equilibria at low temperatures with applications to sedimentary ore deposits
TL;DR: The Gibbs free energies, enthalpies and entropies of 42 dissolved uranium species and 30 uranium-bearing solid phases have been critically evaluated from the literature and estimated when necessary for 25°C.