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• W1969578800 endingPage "235" @default.
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• W1969578800 abstract "This paper describes a chemical model that calculates (solid + liquid) equilibria in the {m1FeCl2 + m2FeCl3}(aq), {m1FeSO4 + m2Fe2(SO4)3}(aq), {m1NaCl + m2FeCl3}(aq), {m1Na2SO4 + m2FeSO4}(aq), {m1NaCl + m2FeCl2}(aq), {m1KCl + m2FeCl3}(aq), {m1K2SO4 + m2Fe2(SO4)3}(aq), {m1KCl + m2FeCl2}(aq), {m1K2SO4 + m2FeSO4}(aq), and {m1MgCl2 + m2FeCl2}(aq) systems, where m denotes molality at T=298.15 K. The Pitzer ion-interaction model has been used for thermodynamic analysis of the experimental activity data in binary FeCl2(aq) and FeCl3(aq) solutions, and ternary solubility data, presented in the literature. The thermodynamic functions needed (binary and ternary parameters of ionic interaction, thermodynamic solubility products) have been calculated and the theoretical solubility isotherms have been plotted. The mixed solution model parameters {θ(MN) and ψ(MNX)} have been chosen on the basis of the compositions of saturated ternary solutions and data on the pure water solubility of the K2SO4 · FeSO4 · 6H2O double salt. The standard chemical potentials of four ferrous {FeCl2 · 4H2O, Na2SO4 · FeSO4 · 4H2O, K2SO4 · FeSO4 · 6H2O, and MgCl2 · FeCl2 · 8H2O} and three ferric {FeCl3 · 6H2O, 2KCl · FeCl3 · H2O, and 2K2SO4 · Fe2(SO4)3 · 14H2O} solid phases have been determined. Comparison of solubility predictions with experimental data not used in model parameterization is given. The component activities of the saturated {m1MgSO4 + m2FeSO4}(aq) and in the mixed crystalline phase were determined and the change of the molar Gibbs free energy of mixing ΔmixG∘m(s) of crystals was determined as a function of the solid phase composition. It is established that at T=298.15 K the mixed (Mg,Fe)SO4 · 7H2O and (Fe,Mg)SO4 · 7H2O crystals show small positive deviations from the ideal mixed crystals. Limitations of the {Fe(II) + Fe(III)} model due to data insufficiencies are discussed." @default.
• W1969578800 created "2016-06-24" @default.
• W1969578800 creator A5029502825 @default.
• W1969578800 date "2004-03-01" @default.
• W1969578800 modified "2023-10-17" @default.
• W1969578800 title "Pitzer ion-interaction parameters for Fe(II) and Fe(III) in the quinary {Na+K+Mg+Cl+SO4+H2O} system at T=298.15 K" @default.
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• W1969578800 doi "https://doi.org/10.1016/j.jct.2003.11.010" @default.
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