Abstract
The vlrlal coefflclent approach of Pitzer has been used to estimate the densities and mean apparent molal volumes of very concentrated brines composed of aqueous NaCI-KCI-MgCI,-CaCI, In the lonlc strength range 8.3-9.6 mol kg-' at 20-40 OC. The theory successfully predlcts these propertles In mixtures based on the coefficients of pure salts. The lncluslon of blnary Interaction term Improves the degree of predlctlon.
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