Journal ArticleDOI
Coprecipitation of Uranium(VI) with Calcite: XAFS, micro-XAS, and luminescence characterization
Richard J. Reeder,Melissa Nugent,C. Drew Tait,David E. Morris,Steve M. Heald,Kenneth M. Beck,Wayne P. Hess,A. Lanzirotti +7 more
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TLDR
In this article, X-ray absorption and luminescence spectroscopies have been used to characterize the local structure and coordination of uranium(VI) species coprecipitated with calcite (CaCO3) from room-temperature aqueous solutions.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 2001-10-15. It has received 213 citations till now. The article focuses on the topics: Uranyl & Calcite.read more
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Modification and preservation of environmental signals in speleothems
Ian J. Fairchild,Claire Smith,Andy Baker,L. Fuller,Christoph Spötl,Dave Mattey,Frank McDermott +6 more
TL;DR: In this article, the use of multiple proxies and improving understanding of formation mechanisms offers a clear way forward, but the climatological meaning of many speleothem records cannot be interpreted unequivocally; this is particularly so for more subtle shifts and shorter time periods.
Journal ArticleDOI
Trace elements in speleothems as recorders of environmental change
TL;DR: In the case of speleothem Mg, a number of case studies have effectively used trace elements such as speleotiem Mg as records of palaeo-aridity, using supporting arguments from modern monitoring or covariations with other parameters such as stable isotopes as discussed by the authors.
Journal ArticleDOI
Effects of seawater carbonate ion concentration and temperature on shell U, Mg, and Sr in cultured planktonic foraminifera
TL;DR: In this article, the sensitivity of calcite produced by two planktonic foraminifera species, Orbulina universa and Globige- rina bulloides, in laboratory culture experiments was investigated.
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Mineral–water interfacial structures revealed by synchrotron X-ray scattering
Paul Fenter,Neil C. Sturchio +1 more
TL;DR: In this article, the authors describe the characteristics of synchrotron-based X-ray scattering techniques that make them uniquely powerful probes of mineral-water interfacial structures and discuss the new insights that have been derived from their application.
References
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Journal ArticleDOI
Multiple-scattering calculations of x-ray-absorption spectra
TL;DR: A high-order multiple-scattering approach to the calculation of polarized x-ray-absorption spectra, which includes both x- Ray- absorption fine structure and x-Ray- absorption near-edge structure, is presented.
Book
Chemical thermodynamics of uranium
TL;DR: The NEA-TDB data base system as discussed by the authors is used for the extraction of the NEA TDB data set and its associated auxiliary data sets, such as ammonium, oxide, hydride and hydroxide species.
ReportDOI
User's guide to phreeqc a computer program for speciation, reaction-path, advective-transport, and inverse geochemical calculations
TL;DR: In this article, the authors propose a method to solve the problem of homonymity in homonym identification, i.e., homonymization, in the context of homology.
Journal Article
The crystal chemistry of hexavalent uranium; polyhedron geometries, bond-valence parameters, and polymerization of polyhedra
TL;DR: The geomeffy, bond valences, and polymerization of hexavalent uranium polyhedra from 105 well-refined structures are analyzed in this article, where a series of coordiaation polyhedr4 from square bipyramidal polyhedras with uranyl ions to holosymmehic octahedral geometry are discussed.