Browsing by Author "Ragnarsdottir K.V."
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Browsing by Author "Ragnarsdottir K.V."
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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) ...
Now showing items 1-14 of 14