Abstract
Water activity measurements by isopiestic method have been carried out on the aqueous solutions of alanine + tri-potassium citrate (K 3Cit) over a range of temperatures at atmospheric pressure. From these measurements, values of the vapor pressure of solutions were determined. The effect of temperature on the vapor–liquid equilibrium of alanine + K 3Cit + H 2O systems has been studied. The experimental water activities have been correlated successfully with the segment-based local composition Wilson and NRTL models. The agreement between the correlations and the experimental data is good.
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