A new set of Pitzer interaction parameters is proposed to describe the excess properties of the H–Na–K–Ca–Mg–NO₃–H₂O system at 298.15 K. From these parameters we reproduce the osmotic coefficient, mean activity coefficients, and density for the binary systems, and also salt solubility in the ternary subsystems. The binary interaction parameters are either selected from the literature or redetermined in this study. In the case of KNO₃–H₂O and HNO₃–H₂O binary systems, partial electrolyte dissociation has to be taken into account to represent accurately all the experimental data up to very high concentrations. Then solubility data of salts in the corresponding ternary systems are used to determine the ternary interaction parameters and the solubility products of the double salts. As KNO₃ and HNO₃ are partially dissociated, we have determined new interaction parameters involving neutral species (for instance η_{KNO3/Na⁺/H⁺} or μ_{HNO3/KNO3/Na⁺}) to draw the phase diagram of quaternary systems Na–K–H–NO₃. To complement the study, we also propose a set of volumetric Pitzer interaction parameters for all the binary systems and for the H–K–NO₃ ternary system, so solution density can be computed at 298.15 K.

中文翻译：

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在298.15 K下预测H–Na–K–Ca–Mg–NO ₃ –H ₂ O系统中溶液性质和盐溶解度的Pitzer参数化

提出了一组新的Pitzer相互作用参数来描述H–Na–K–Ca–Mg–NO ₃ –H ₂ O系统在298.15 K时的过剩性质。根据这些参数，我们可以得出渗透系数，平均活度系数，二元系统的密度和密度，以及三元子系统中的盐溶解度。二元相互作用参数可以从文献中选择，也可以在本研究中重新确定。对于KNO ₃ -H ₂ O和HNO ₃ -H ₂在二元系统中，必须考虑电解质的部分解离才能准确地表示所有实验数据，直到非常高的浓度。然后，将盐在相应的三元体系中的溶解度数据用于确定三元相互作用参数和复盐的溶解度乘积。由于KNO ₃和HNO ₃部分解离，我们确定了涉及中性物质的新相互作用参数（例如_{ηKNO 3 / Na ⁺ / H ⁺}或_{μHNO 3 / KNO 3 / Na ⁺}）以绘制四元体系的相图。 Na–K–H–NO ₃。为了补充该研究，我们还为所有二元系统和H–K–NO ₃三元系统提出了一组体积Pitzer相互作用参数，因此可以在298.15 K下计算溶液密度。