Journal ArticleDOI
Surface catalysis of uranium(VI) reduction by iron(II)
Reads0
Chats0
TLDR
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
More filters
Journal ArticleDOI
Heterogeneous Reduction of PuO2 with Fe(II): Importance of the Fe(III) Reaction Product
Andrew R. Felmy,Dean A. Moore,Kevin M. Rosso,Odeta Qafoku,Dhanpat Rai,Edgar C. Buck,Eugene S. Ilton +6 more
TL;DR: This study highlights the importance of the Fe(III) reaction product in actinide reduction rate and extent by Fe(II) and re-evaluated established protocols for determining Pu(III), showing that it is important to eliminate dissolved oxygen from the TTA solutions for accurate determinations.
Journal ArticleDOI
Palaeoenvironmental controls on the uranium distribution in an Upper Carboniferous black shale (Gastrioceras listeri Marine Band) and associated strata; England
TL;DR: In this paper, geochemical and palaeontological indicators suggest that the highest authigenic uranium concentrations are within marine sediments associated with the most oxygen-restricted biofacies (ORBs 2 and 3), rather than within the middle of more persistently anoxic intervals.
Journal ArticleDOI
A combined experimental study of vivianite and As (V) reactivity in the pH range 2-11
V. Thinnappan,C.M. Merrifield,Farhana Islam,Farhana Islam,David A. Polya,Paul L. Wincott,Roy A. Wogelius +6 more
TL;DR: In this paper, four different sets of experiments were completed in order to constrain vivianite reactivity under conditions pertinent to As(V)-bearing groundwater systems, including titration experiments in the pH range 4-9 to determine the zero point of charge (ZPC), showing that the ZPC lies at a pH of approximately 5.3.
Journal ArticleDOI
Biogenic uraninite precipitation and its reoxidation by iron(III) (hydr)oxides: A reaction modeling approach
Nicolas Spycher,Montarat Issarangkun,Brandy D. Stewart,S. Sevinç Şengör,Eileen Belding,Timothy R. Ginn,Brent M. Peyton,Rajesh K. Sani +7 more
TL;DR: In this paper, the role of sulfide and Fe(II) in UO 2 reoxidation was examined using multicomponent biogeochemical simulations, and the effect of nanoscale particle size on stability was discussed.
Journal ArticleDOI
Tc(VII) reduction kinetics by titanomagnetite (Fe3−xTixO4) nanoparticles
TL;DR: In this article, the authors investigated the heterogeneous reduction of the highly soluble pertechnetate anion [Tc(VII)O 4 − ] to sparingly soluble Tc(IV)-bearing solids by a set of mixed-valent titanium-doped magnetite nanoparticles, structurally and chemically analogous to titanomagnetites naturally present in Hanford sediments.
References
More filters
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.