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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Journal ArticleDOI
Thermodynamics of U(VI) sorption onto Shewanellaputrefaciens
TL;DR: In this paper, the authors conducted acid-base potentiometric titrations and U(VI) sorption experiments using the Gram negative, facultatively anaerobic bacterium Shewanella putrefaciens.
Journal ArticleDOI
Uranium redox transition pathways in acetate-amended sediments
John R. Bargar,Kenneth H. Williams,Kate M. Campbell,Philip E. Long,Joanne E. Stubbs,ElenaI I. Suvorova,Juan S. Lezama-Pacheco,Daniel S. Alessi,Malgorzata Alicja Stylo,Samuel M. Webb,James A. Davis,Daniel E. Giammar,Lisa Y. Blue,Rizlan Bernier-Latmani +13 more
TL;DR: In this article, the authors present results from an in situ study of uranium redox transitions occurring in aquifer sediments under sulfate-reducing conditions, and they propose a biotic-abiotic transition pathway in which biomass-hosted mackinawite (FeS) is an electron source to reduce U(VI) to U(IV), which subsequently reacts with biomass to produce monomeric u(IV) species.
Journal ArticleDOI
Kinetics and Mechanisms for Reactions of Fe(II) with Iron(III) Oxides
TL;DR: It is proposed that electron transfer from adsorbed Fe(II) to structural Fe(III) in hematite results in oxidation of Fe( II) to AFO on the surface of hematITE and that solid-phase contact among hematites, AFO, and structural Fe (II) produces magnetite (Fe3O4).
Journal ArticleDOI
Adsorption and surface oxidation of Fe(II) on metal (hydr)oxides.
TL;DR: In this paper, the CD coefficients have been linked to the mechanism of Fe(II) adsorption by nonferric and ferric (hydr)oxides with surface complexation modeling.
Journal ArticleDOI
Abiotic transformation of hexahydro-1,3,5-trinitro-1,3,5-triazine by Fe(II) bound to magnetite.
TL;DR: In this article, the transformation of RDX by ferrous iron (Fe(II)) associated with a mineral surface was investigated, and the results indicated that Fe(II)-magnetite suspensions indicate a possible remedial option that could be employed in natural and engineered environments where iron oxides are abundant and magnetite is present.
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.