Salt desorption from surfaces of non-aqueous solvents

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Abstract
Following previous studies of the desorption of salts from the surface of water, the desorption of several salts from various non-aqueous solvents has been investigated. Three protic and 3 dipolar-aprotic liquids were used. The surface properties of the solvents in the absence of electrolytes are discussed and it is observed that the molar excess surface entropies of the aprotic solvents are more positive than those of the protic solvents. Salt desorption, determined from measurements of surface tension, is discussed in terms of purely electrostatic models, and also ion solvation. The extent of salt desorption in systems where strong ion solvation exists is related to the thickness of the primary solvation sheath around the ions. In the present context water does not behave as an anomalous solvent but in a way similar to the other protic solvents.

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