Thermodynamics of the association of aqueous europium(III) and sulfate ions

Chemistry and thermodynamics of europium and some of its simpler inorganic compounds and aqueous species

“…We will use these approximations for our calculations with an assumed 30% uncertainty. Then, -RT In Kx = -46.5 ± 0.9 kJ mol-1, Several values have also been reported for the second association reaction214, 215,246,247,248 Eu(S04)+(aq) + S042-(aq) = Eu(S04)2-(aq) (50) Apparent stability constants for the formation of the Five of the above studies also report enthalpies of reaction corresponding to reaction 49.246'248'250'251 They are in fairly good agreement and show no trend with concentration, so they were averaged to yield the recommended value of 17.0 ± 1.4 kJ mol"1. Thus, Two reported values for the enthalpy of reaction 50 are 10.0 kJ mol"1 at / = 2.0 mol L"1 246 and 6.3 ± 0.4 kJ moT1 in dilute solution.…”

Determination of SO4β1 for yttrium and the rare earth elements at I = 0.66 m and t = 25°C—implications for YREE solution speciation in sulfate-rich waters

“…Also not included are data of Hardwick and Robertson (1951), who studied sulfate complexation of Ce(IV). Hale and Spedding (1972a), UV-spectrophotometry. Stability constant expressed in terms of free ion concentrations.…”

“…(m) Farrow and Purdie (1973a), recalculated data of Spedding and Jaffe (1954). Eu value from Hale and Spedding (1972a). (n) Smith and Martell (1976), critical evaluation of the best available data in the literature.…”

Apparent molar heat capacities and apparent molar volumes ofY2(SO4)3(aq),La2(SO4)3(aq),Pr2(SO4)3(aq),Nd2(SO4)3(aq),Eu2(SO4)3(aq),Dy2(SO4)3(aq),Ho2(SO4)3(aq), andLu2(SO4)3(aq)atT= 298.15 K andp= 0.1 MPa

“…(42) ) from various assessments (7,(44)(45)(46)(47)(48) show maximum differences of lg K (RSO a The experimental properties in these two columns, (ρ s − ρ w ) and 10 Farrow and Purdie (44) derived values of K (RSO + 4 ) at T = 298.15 K from an analysis of electrical conductances for 10 of the R 2 (SO 4 ) 3 (aq), which included the earlier results of Spedding and Jaffe (45) and some new measurements for Sm 2 (SO 4 ) 3 (aq) and Lu 2 (SO 4 ) 3 (aq). They also noted that the value of K (EuSO + 4 ) reported by Hale and Spedding (46) from u.v. spectrophotometric measurements was consistent with the results derived from electrical conductances.…”