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Isopiestic measurements were performed in binary and ternary systems of the type Fe2(SO4)3–H2SO4–H2O, FeCl3–H2O, and FeCl3–MCln–H2O (M = Na, K, Mg, or Ca). Numeric data for water isoactivity lines are presented and osmotic coefficients are calculated. The obtained data were recalculated using Pitzer’s equations. Pertinent parameters are given.

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Binary and ternary interaction parameters of the Pitzer formalism for the thermodynamic modeling of the fission product Cs+ in concentrated salt solutions of the hexary oceanic system Na–K–Mg–Ca–Cl–SO4–H2O at 25 °C were calculated from experimental isopiestic, potentiometric, and solubility data available in the literature. The obtained parameters were checked by comparing measured and predicted water activities and solubilities for binary, ternary, and quaternary systems.

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