Journal ArticleDOI
The aqueous geochemistry of the rare-earth elements and yttrium
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TLDR
Theoretical considerations suggest that trivalent REE and Y should exhibit strong, predominantly electrostatic complexing with hard ligands such as fluoride, sulfate, phosphate, carbonate and hydroxide and this is borne out by the available experimental data.About:
This article is published in Chemical Geology.The article was published on 1990-01-01. It has received 735 citations till now. The article focuses on the topics: Fluoride & Hydroxide.read more
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Rare-earth element mobility during hydrothermal and metamorphic fluid-rock interaction and the significance of the oxidation state of europium
TL;DR: In this paper, the Eu 3+ Eu 2+ redox boundary for temperatures up to 600°C and pressures up to 4000 bar has been calculated using the revised HKF model for the prediction of the molal Gibbs free energy of formation at elevated pressures and temperatures.
Book ChapterDOI
Trace Elements in River Waters
TL;DR: In this article, the authors reviewed the recent literature on trace elements in rivers, in particular by incorporating the results derived from recent ICP-MS measurements, and the basic questions which they want to address are the following: What are the trace element levels in river waters? What controls their abundance in rivers and fractionation in the weathering+transport system?
Journal ArticleDOI
Rare earth elements in hydrothermal systems: Estimates of standard partial molal thermodynamic properties of aqueous complexes of the rare earth elements at high pressures and temperatures
TL;DR: In this paper, the authors used predicted association constants for rare earth element (REE) complexes to calculate the speciation of the REEs in simulated and natural fluid compositions over ranges of pH, temperature, and pressure.
Journal ArticleDOI
The lanthanide tetrad effect and its correlation with k/rb, eu/eu*, sr/eu,y/ho, and zr/hf of evolving peraluminous granite suites
TL;DR: In this paper, the tetrad effect (TE1,3) was investigated in Variscan peraluminous granites of mid-eastern Germany (Central Erzgebirge, Wasserstein and Northern Oberpfalz) and the degree of tetrad effects was estimated and plotted vs. K/Rb, Sr/Eu, Eu/ Eu∗, Y/Ho, and Zr/Hf.
Journal ArticleDOI
Rare earth elements in pore waters of marine sediments
TL;DR: In this paper, the rare earth elements (REEs) were measured in pore waters of the upper ∼25 cm of sediment from one site off Peru and three sites on the California margin.
References
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Journal ArticleDOI
Hard and soft acids and bases
TL;DR: In this paper, the rate data for the generalized nucleophilic displacement reaction were reviewed, and the authors presented a method to estimate the rate of the generalized displacement reaction in terms of the number of nucleophiles.
Book
Inorganic Chemistry: Principles of Structure and Reactivity
TL;DR: In this article, inorganic chemistry principles of structure and reactivity are presented. But, they do not cover how to use these principles in the design of products, and they are not available in any type of product.
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.
Journal ArticleDOI
Theoretical prediction of the thermodynamic behavior of aqueous electrolytes by high pressures and temperatures; IV, Calculation of activity coefficients, osmotic coefficients, and apparent molal and standard and relative partial molal properties to 600 degrees C and 5kb
Journal ArticleDOI
Thermodynamics of hydrothermal systems at elevated temperatures and pressures
TL;DR: In this article, sufficient thermodynamic data are available to permit calculation of equilibrium constants for a large number of hydrothermal reactions, where the calculations involve entropy estimates, application of average heat capacities, and/or assumptions concerning the temperature dependence of thermodynamic variables and the relative importance of electrostatic and non-electrostatic interaction among the species.