Abstract
Correa, A., Comesana, J.F. and Sereno, A.M., 1994. Measurement of water activity in water-urea-“sugar” and water-urea-“polyol” systems, and its prediction by the ASOG group contribution method. Fluid Phase Equilibria , 98: 189-199. Water activities in aqueous solutions of urea with sugars (glucose and fructose) and polyols (glycerol, sorbitol and mannitol) at 25°C were measured with an electric hygrometer. Concentration ranges considered in this study reached solubility limits for each solute. Correlation and prediction of water activities using the ASOG group contribution method required the use of a set of new specific groups. The interaction parameters for such new groups were calculated from new and previously published experimental data. Average percent deviations of 0.4% between experimental and predicted a w values were obtained.
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