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Pure Appl. Chem. Vol. 73, No. 5, pp. 831-844 (2001)

Pure and Applied Chemistry

Vol. 73, Issue 5

Solubility equilibria in multicomponent oceanic salt systems from t = 0 to 200 °C. Model parameterization and databases*,+

W. Voigt

University of Mining and Technology Freiberg, Institute of Inorganic Chemistry, Leipziger Strasse 29, 09596 Freiberg, Germany

Abstract: In this paper the application of Pitzer's equations for modeling of solubility equilibria in the hexary oceanic salt system Na+, K+, Mg2+, Ca2+ // Cl­, SO42­­H2 O and its subsystems over large temperature intervals is discussed. Lack of ternary solution data considerably restricts the use of the equations as an evaluation tool for the quality of solubility data. Models optimized for the available data in two temperature intervals have been derived. Since Pitzer's model gives no guidance for temperature dependence, the number of parameters is dominated by temperature coefficients. Thus, for extended temperature intervals other approaches like the Cohen-Adad formalism can be advantageous in solubility data evaluation.

*Lecture presented at the 9th IUPAC International Symposium on Solubility Phenomena (9th ISSP), Hammamet, Tunisia, 25–28 July 2000. Other presentations are published in this issue, pp. 761–844.

+ Dedicated to Prof. Dr. Dr. h.c. mult. H.-H. Emons on the occasion of his 70th birthday.

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