Pressure-volume-temperature properties of aqueous mixed electrolyte solutions: sodium chloride + barium chloride from 25 to 140.degree.C

Abstract

Pressure-volume-temperature (PVT) properties of aqueous mixed electrolyte solutions are useful for many applications in geology, oil recovery, oceanography, and geothermal brines. The densities of aqueous electrolyte mixtures of NaCl + BaCl[sub 2] have been measured from 25 to 140 C at constant total ionic strengths of 0.5, 1.0, 2.5, and 4.5 mol. The mean apparent molal volumes calculated from the experimental density values have been treated using the Pitzer equations, and the ion interaction parameters of mixing have been evaluated. The required apparent molal volumes for the pure aqueous BaCl[sub 2] and NaCl have been obtained from the earlier work and that of Rogers and Pitzer, respectively.