Author
W. Fleischer
Bio: W. Fleischer is an academic researcher. The author has contributed to research in topics: Stability constants of complexes. The author has an hindex of 1, co-authored 1 publications receiving 39 citations.
Topics: Stability constants of complexes
Papers
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TL;DR: In this paper, the formation of the fluoro complexes of rare earth elements (REE) has been studied in 1 M NaCl-aqueous medium at 25°C and pH-rang ⩽ 5.
39 citations
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TL;DR: 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.
735 citations
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.
613 citations
TL;DR: In this article, the stability constants for trivalent REE complexes were predicted up to 350°C at saturated water vapor pressure using Helgeson's electrostatic approach combined with the isocoulombic approach and available experimental thermodynamic data at low temperatures.
518 citations
TL;DR: In this paper, the characteristics and properties of lanthanides in seawater and the rationale for studying the lanthanide composition of natural waters are discussed, as well as the biogeochemical and physical processes responsible for these distributions.
Abstract: Publisher Summary This chapter discusses the characteristics and properties of lanthanides in seawater and presents the rationale for studying the lanthanide composition of natural waters. The lanthanides are composed of a group of fourteen elements (La, Ce, Pf, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu). There are anthropogenic sources of lanthanides to the atmosphere (and presumably to the ocean) in the form of particles produced during the cracking of oil and the combustion of oil and gasoline products. A major objective of chemical oceanography is to understand processes controlling the concentration, distribution, speciation, and flux of elements in the oceans. The chapter describes and discusses lanthanide distributions in the oceans and the biogeochemical and physical processes responsible for these distributions. It presents the profiles of lanthanide concentrations in the water column and their variations within and between ocean basins. The redox geochemistry of Ce as revealed by vertical and horizontal variations in the Ce anomaly is discussed. The inter-oceanic mass fractionation of the strictly trivalent lanthanides is also described.
325 citations
TL;DR: In this article, the authors show that contact metamorphic marbles, affected by metasomatic fluids at the contact to the Bergell and Adamello Intrusives, contain various accessory minerals (zirconolite, allanite, titanite, rutile, geikielite, hoegbomite), which provide new evidence for the hydrothermal mobility of Ti and Zr.
Abstract: Contact metamorphic marbles, affected by metasomatic fluids at the contact to the Bergell and Adamello Intrusives, contain various accessory minerals (zirconolite, allanite, titanite, rutile, geikielite, hoegbomite), which provide new evidence for the hydrothermal mobility of Ti and Zr. In both examples, Ti and Zr migrated along with U, Th, Y and REE in a metasomatic fluid rich in potassium. The composition of the main minerals (fluorine-rich phlogopite, pargasite and titanian clinohumite) and the abundance of fluor-apatite demonstrate that fluorine and phosphorus were important components of the fluid. The textural relationships indicate that the formation of the accessory phases is linked to the crystallization of the hydrous minerals.
109 citations