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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