Abstract
The solubility data of barite and celestite in NaCl, KCl, CaCl 2, MgCl 2 and Na 2SO 4 aqueous solutions at 25°C have been evaluated using Pitzer's ion interaction model. From the examples of BaSO 4 and SrSO 4 the limited influence of the binary interaction parameters for slightly soluble salts is demonstrated. Even when most of the mixing parameters are omitted the model still accurately predicts barite and celestite solubilities in various ionic media, except for the case of barite in seawater. The analysis of the role of these various parameters shows that the activity coefficients of trace elements in natural waters can be calculated by Pitzer's model using only a small number of parameters. In the case of barite solubility in seawater, the discrepancy between the calculated and measured values can be explained by the formation of a (Ba,Sr)SO 4 solid solution during the experiments performed by reaching equilibrium by precipitation (supersaturation). This phase controls the Ba content of the solution which may then be higher than pure barite solubility as calculated by the model.
Published Version
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