Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Process Engineering, Biotechnology, Nutrition Technology
A new method of representation of electrolyte solution nonideality is derived, on the basis of similar assumptions, from a model applied by Cruz and Renon (1978) to binary electrolyte solutions. In order to test the validity of the model for representation of strong electrolyte properties, parameters were fitted to osmotic coefficient data for single, completely dissociated salts in aqueous solutions and were used to calculate osmotic coefficients of mixed aqueous electrolytes. Results are compared with those given by Chen's local composition model (Chen et al., 1982; Aspen, 1983) and Pitzer's truncated model (Pitzer, 1973, 1979; Pitzer and Mayorga, 1973; Pitzer and Kim, 1974), the same number of adjustable parameters being used in each case.The average standard deviations for single electrolytes are within 1% in the case of 1-1 salts for the three models, and within 2% in the other cases, except for Chen's model (5%). As for predicted results, both local-composition models yield standard deviations of less than 2%, while the accuracy given by the Pitzer model is better than 1.5%.
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