Other
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006gecoa..70..983m&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 70, Issue 4, p. 983-992.
Other
3
Scientific paper
The formation constants of neodymium complexes in sulfate solutions have been determined spectrophotometrically at temperatures of 30 250 °C and a pressure of 100 bars. The dominant species in the solution are NdSO4+ and Nd(SO4)2-, with the latter complex being more important at higher temperature. Equilibrium constants were calculated for the following reactions: Nd+SO4=NdSO4,β1; Nd+2·SO4=Nd(SO4),β2; NdSO4+SO4=Nd(SO4),Ks. The values of β1 and β2, were determined for 30 and 100 °C, whereas for higher temperatures it was only possible to determine the stepwise formation constant Ks. The values of the formation constants obtained in this study for 30 and 100 °C are in excellent agreement with those predicted theoretically by Wood [Wood, S.A., 1990b. The aqueous geochemistry of the rare-earth elements and yttrium. 2. Theoretical predictions of speciation in hydrothermal solutions to 350 °C at saturation water vapor pressure. Chem. Geol.88 (1 2), 99 125] and Haas et al. [Haas, J.R., Shock, E.L., Sassani, D.C., 1995. Rare earth elements in hydrothermal sysytems: estimates of standard partial molal thermodynamic properties of aqueous complexes of the rare earth elements at high pressures and temperatures. Geochim. Cosmochim. Acta59 (21), 4329 4350], and those for the stepwise formation constant (Ks) agree reasonably well with the predictions of Wood (1990b).
Migdisov Art A.
Reukov V. V.
Williams-Jones Anthony E.
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