Critical locus of aqueous solutions of sodium chloride

Experimental data reported in the literature indicate a strong dependence o f the critical temperature of aqueous solutions of sodium chloride on salt concentration, especially in the limit of pure water. Critical pressures an d densities also show strong dependences on salt concentration. We propose a new set of equations for the critical locus and compare the results with evaluations reported previously by a number of investigators. The new equat ions yield a better description of the experimental data from the limit of pure water to the highest salt concentration for which data are available ( 0.3 mass fraction of sodium chloride).