Solubility equilibria in multicomponent oceanic salt systems from t=0 to 200 degrees C. Model parameterization and databases

In this paper the application of Fitter's equations for modeling of solubil ity equilibria in the hexary oceanic salt system Na+, K+, Mg2+, Ca2+ // Cl- , SO42--H2O and its subsystems over large temperature intervals is discusse d. Lack of ternary solution data considerably restricts the use of the equa tions as an evaluation tool for the quality of solubility data. Models opti mized for the available data in two temperature intervals have been derived . Since Fitter's model gives no guidance for temperature dependence, the nu mber of parameters is dominated by temperature coefficients. Thus, for exte nded temperature intervals other approaches like the Cohen-Adad formalism c an be advantageous in solubility data evaluation.