Browsing ELibrary by Author "Ragnarsdottir K.V."

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A POTENTIOMETRIC STUDY OF EU3+ COMPLEXATION WITH ACETATE LIGAND FROM 25 TO 170°C AT P SAT

Zotov A.V.; Tagirov B.R.; Diakonov I.I.; Ragnarsdottir K.V. (2002)

Thermodynamic properties for europium acetate (EuCH3COO2+ and Eu(CH3COO)2+) complexes were studied by potentiometry at temperatures from 25 to 170°C at the saturation pressure of water. The thermodynamic association constants ...
AN EXAFS SPECTROSCOPIC STUDY OF AQUEOUS ANTIMONY(III)-CHLORIDE COMPLEXATION AT TEMPERATURES FROM 25 TO 250°C

Oelkers E.H.; Sherman D.M.; Ragnarsdottir K.V.; Collins C. (1998)

The X-ray adsorption fine structure (EXAFS) spectroscopy of antimony(III)-chloride solutions were obtained at temperatures from 25 to 250°C at pressures corresponding to the liquid-vapor equilibrium curve for H2O. Two ...
AN EXTENDED X-RAY ABSORPTION FINE STRUCTURE SPECTROSCOPY INVESTIGATION OF CADMIUM SORPTION ON CRYPTOMELANE (KMN8O16)

Randall S.R.; Sherman D.M.; Ragnarsdottir K.V. (1998)

The mobility of cadmium in the environment is strongly inhibited by sorption onto Fe and Mn (hydr)oxide minerals such as cryptomelane (KMn8O16). Adsorption experiments showed that cryptomelane was able to sorb two thirds ...
ANTIMONY TRANSPORT IN HYDROTHERMAL SOLUTIONS: AN EXAFS STUDY OF ANTIMONY(V) COMPLEXATION IN ALKALINE SULFIDE AND SULFIDE-CHLORIDE BRINES AT TEMPERATURES FROM 25°C TO 300°C AT PSAT

Sherman D.M.; Ragnarsdottir K.V.; Oelkers E.H. (2000)

Existing electrochemical data suggest that under alkaline conditions, Sb(V) sulfide complexes may be stable under conditions as reducing as those found in hydrothermal ore solutions. To assess the nature of Sb(V) complexes ...
AQUEOUS SPECIATION OF YTTRIUM AT TEMPERATURES FROM 25 TO 340°C AT PSAT: AN IN SITU EXAFS STUDY

Ragnarsdottir K.V.; Sherman D.M.; Collins C.R.; Odkers E.H. (1998)

The solvation environment of aqueous yttrium in chloride bearing solutions was characterised by EXAFS spectroscopy at temperatures from 25 to 340°C. Four solution compositions were considered containing 0.1 M YCl3, 0.1 M ...
COMPLEXATION OF CU2+ IN OXIDIZED NACL BRINES FROM 25°C TO 175°C: RESULTS FROM IN SITU EXAFS SPECTROSCOPY

Collings M.D.; Sherman D.M.; Ragnarsdottir K.V. (2000)

In order to understand the significance of Cu2+ transport in oxidized brines and in secondary enrichment processes, we studied the speciation of 0.1 M CuCl2 in 0, 2, and 5 M NaCl solutions from 25°C to 175°C using in situ ...
CONTROLS ON POLYACRYLAMIDE ADSORPTION TO QUARTZ, KAOLINITE, AND FELDSPAR

Graveling G.J.; Ragnarsdottir K.V.; Allen G.C.; Eastman J.; Brady P.V.; Balsley S.D.; Skuse D.R. (1997)

Potentiometric titrations of quartz, kaolinite, feldspar, and partially hydrolysed polyacrylamide (HPAM), and sorption measurements of HPAM on the minerals, allows identification of the general mechanisms of polyacrylamide ...
EFFECT OF INORGANIC AND ORGANIC LIGANDS ON THE MECHANISM OF CADMIUM SORPTION TO GOETHITE - ROLE OF COMPLEXATION AND ADSORPTION

Collins C.R.; Ragnarsdottir K.V.; Sherman D.M. (1999)

Extended X-ray Absorption Fine Structure (EXAFS) spectroscopic data for Cd2+ sorbed on goethite in the presence of phosphate, sulphate and humate indicate that cadmium is surrounded by a first shell of ~6 +/- 1 O atoms at ...
SORPTION OF AS(V) ON GREEN RUST (FE4(II)FE2(III)(OH)12SO4 . 3H2O) AND LEPIDOCROCITE (γ-FEOOH): SURFACE COMPLEXES FROM EXAFS SPECTROSCOPY

Randall S.R.; Sherman D.M.; Ragnarsdottir K.V. (2001)

Green rust (Fe4(II)Fe2(III)(OH)12SO4 . 3H2O) is an intermediate phase in the formation of iron (oxyhydr)oxides such as goethite, lepidocrocite and magnetite; current thinking is that it occurs in many soil and sediment ...
SPECIATION OF TIN (SN2+ AND SN4+) IN AQUEOUS CL SOLUTIONS FROM 25°C TO 350°C: AN IN SITU EXAFS STUDY

Sherman D.M.; Ragnarsdottir K.V.; Oelkers E.H.; Collins C.R. (2000)

X-ray absorption fine structure spectroscopic (EXAFS) measurements were made of tin chloride solutions at temperatures from 25°C to 350°C. In Cl concentrations of 0.5 to 2.5 M, aqueous tin(II) forms SnCln2-n complexes with ...
STANDARD THERMODYNAMIC PROPERTIES AND HEAT CAPACITY EQUATIONS OF RARE EARTH HYDROXIDES: II. CE(III)-, PR-, SM-, EU(III)-, GD-, TB-, DY-, HO-, ER-, TM-, YB-, AND Y-HYDROXIDES. COMPARISON OF THERMOCHEMICAL AND SOLUBILITY DATA

Diakonov I.I.; Ragnarsdottir K.V.; Tegirov B.R. (1998)

Standard thermodynamic properties at 298.15 K, 1 bar for the solid hydroxides of Y, Ce(III), Pr, Sm, Eu(III), Gd, Tb, Dy, Ho, Er, Tm and Yb were calculated from thermochemical data available in the literature. `3Rn' heat ...
THE DISSOLUTION OF APATITE IN THE PRESENCE OF AQUEOUS METAL CATIONS AT PH 2-7

Valsami-Jones E.; Ragnarsdottir K.V.; Putnis A.; Bosbach D.; Kemp A.J.; Cressey G. (1998)

Apatite dissolution was studied at 25°C in a series of batch experiments carried out within the pH range of 2-7 with or without the presence of aqueous Pb2+ or Cd2+. The synthetic, microcrystalline hydroxylapatite used in ...
THE MECHANISM OF CADMIUM SURFACE COMPLEXATION ON IRON OXYHYDROXIDE MINERALS

Randall S.R.; Sherman D.M.; Ragnarsdottir K.V.; Collins C.R. (1999)

Many sediment and soil systems have become significantly contaminated with cadmium, and earth scientists are now required to make increasingly accurate predictions of the risks that this contamination poses. This necessitates ...
THE REDUCTION OF AQUEOUS AU3+ BY SULFIDE MINERALS AND GREEN RUST PHASES

Heasman D.M.; Sherman D.M.; Ragnarsdottir K.V. (2003)

The reactions of Au3+ with green rust, stibnite, pyrite, and chalcopyrite were investigated in the laboratory and the size of the gold clusters formed was measured using extended X-ray absorption fine structure (EXAFS) ...

Browsing ELibrary by Author "Ragnarsdottir K.V."

Browsing ELibrary by Author "Ragnarsdottir K.V."

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