Setschenow Equation, modified

The solubilities of carbon dioxide in aqueous solutions of mixed salts chosen from eight electrolytes (NaCl, KCl, Na2SO>, NH Cl, AfgSOj, (HHh)2SOh, CaCl2, KNOs) were measured at 25° C and 1 atm by the saturation method. Experimental results for the mixed-salt system were not described easily by the modified Setschenow Equation. However, they were correlated very well by an empirical two-parameter equation. The parameters in the equation for the binary and ternary salt solutions could be estimated easily from these equations for the components of the mixed salts. 

The data have, however, been obtained for only a few systems by Onda et al. (J), Joosten and Danckwerts (2), and Hikita et al. (3). These authors also proposed methods for estimating the solubility of gases in aqueous mixed-salt solutions from the corresponding data for each salt in the systems. These studies are extensions of the empirical method proposed by van Krevelen and Hoftijzer (4) on the basis of the following modified Setschenow Equation. 

However, from the measurements of solubilities of oxygen (6,7) and carbon dioxide (8) in aqueous single-salt solutions over a wide range of salt concentration, it was found that data for many systems could not be correlated by the empirical Setschenow Equation. Therefore, the modified Setschenow Equation can not always be used to estimate satisfactorily the gas solubility data over a wide range of salt concentrations. 

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See also in sourсe #XX -- [ ]

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