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
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Remobilization of authigenic uranium in marine sediments by bioturbation
Yan Zheng,Yan Zheng,Robert F. Anderson,Robert F. Anderson,Alexander van Geen,Martin Q. Fleisher +5 more
TL;DR: In this article, sites characterized by a range of bottom-water oxygen (BWO) and organic carbon flux (OCF) were studied to understand the conditions that determine formation and preservation of authigenic U in marine sediments.
Journal ArticleDOI
Reduction of TcO4- by sediment-associated biogenic Fe(II)
James K. Fredrickson,John M. Zachara,David W. Kennedy,Ravi K. Kukkadapu,James P. McKinley,Steve M. Heald,Steve M. Heald,Chongxuan Liu,Andrew E. Plymale +8 more
TL;DR: In this paper, the potential for reduction of 99TcO4−(aq) to poorly soluble TcO2 · nH2O(s) by biogenic sediment-associated Fe(II) was investigated with three Fe(III)-oxide containing subsurface materials and the dissimilatory metal-reducing subsural bacterium Shewanella putrefaciens CN32.
Journal ArticleDOI
Electron transfer at the mineral/water interface: Selenium reduction by ferrous iron sorbed on clay
Laurent Charlet,Andreas C. Scheinost,Christophe Tournassat,Jean-Marc Greneche,Antoine Géhin,Alejandro Fernandez-Martinez,S. Coudert,Delphine Tisserand,Jocelyne Brendle +8 more
TL;DR: In this article, the authors investigated the long-term kinetics of selenite ( Se(IV)O 3 - ) sorption to montmorillonite in the presence of Fe2+ under anoxic conditions.
Journal ArticleDOI
The significance of surface complexation reactions in hydrologic systems: a geochemist's perspective
TL;DR: In this paper, the application of thermodynamic principles to quantify aqueous complexation reactions is described and a brief overview of a few of the methods that have been used to characterize reactive sites on mineral surfaces.
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Fe(II) sorption on hematite: new insights based on spectroscopic measurements.
TL;DR: The spectroscopic demonstration of two distinctly different sorption endpoints, that is an Fe(III) coating formed from electron transfer or a stable, sorbed Fe(II) phase, challenges us to reconsider the authors' traditional interpretations and modeling of Fe( II) sorption behavior.
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.