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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Comparison of arsenic(V) and arsenic(III) sorption onto iron oxide minerals: implications for arsenic mobility.
Suvasis Dixit,Janet G. Hering +1 more
TL;DR: The sorption data indicate that, under most of the chemical conditions investigated in this study, reduction of As(V) in the presence of HFO or goethite would have only minor effects on or even decrease its mobility in the environment at near-neutral pH conditions.
Journal ArticleDOI
Biogeochemical Redox Processes and their Impact on Contaminant Dynamics
Thomas Borch,Ruben Kretzschmar,Andreas Kappler,Philippe Van Cappellen,Matthew Ginder-Vogel,Andreas Voegelin,Kate M. Campbell +6 more
TL;DR: Recent advances in the understanding of biogeochemical redox processes are highlighted and their impact on contaminant fate and transport, including future research needs are highlighted.
Journal ArticleDOI
Surface complexation of ferrous iron and carbonate on ferrihydrite and the mobilization of arsenic.
TL;DR: Model calculations confirm that sorption of particularly carbonate at common soil and groundwater concentrations reduces the sorption capacity of arsenic on ferrihydrite significantly, a cause for the high concentrations of arsenic in groundwater in Bangladesh.
Journal ArticleDOI
Aquatic surface chemistry: Edited by Werner Stumm. Wiley, New York. 1987. $69.95 (ISBN 0471822951)
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GeoChip: a comprehensive microarray for investigating biogeochemical, ecological and environmental processes
Zhili He,Terry J. Gentry,Terry J. Gentry,Christopher W. Schadt,Liyou Wu,Liyou Wu,Jost Liebich,Jost Liebich,Song C. Chong,Zhijian Huang,Zhijian Huang,Wei-Min Wu,Baohua Gu,Phil Jardine,Craig S. Criddle,Jizhong Zhou,Jizhong Zhou +16 more
TL;DR: This is the first comprehensive microarray currently available for studying biogeochemical processes and functional activities of microbial communities important to human health, agriculture, energy, global climate change, ecosystem management, and environmental cleanup and restoration.
References
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Experimental study and modeling of the U(VI)-Fe(OH)3 surface precipitation/coprecipitation equilibria
TL;DR: In this paper, a simple thermodynamic approach has been proposed in order to describe the post-adsorption phenomena of the coprecipitation of U(VI) with Fe(III) oxyhydroxides, by means of chemical solution and spectroscopic techniques.
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Redox processes catalyzed by hydrous oxide surfaces
TL;DR: In this paper, it is shown that vanadyl oxygenation is accelerated by surface MO− groups; a similar effect is observed in solution due to coordination by OH−, and a catalytic dissolution of hematite by Fe(II) and oxalate is interpreted in terms of an electron transfer through the bridging oxalates ligand, FE(III)-oxalate-Fe(II).
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Desorption and Extraction of Selected Heavy Metals from Soils
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Reactive transport of uranyl in a goethite column: an experimental and modelling study
TL;DR: In this article, the adsorption of uranium (VI) at atmospheric CO2 partial pressure in a bicarbonate background ionic medium (pH 9.0±0.2) was investigated.
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Equilibrium and structural studies of silicon(iv) and aluminium(iii) in aqueous solution. V. Acidity constants of silicic acid and the ionic product of water in the medium range 0.05–2.0 M Na(CI) at 25°C
TL;DR: In this paper, the apparent ionization constants for silicic acid, k 1 and k 2, and the ionic product of water, k w, have been determined in 0.0 M Na(CI) media at 25°C.