Abstract
The densities of 1,3-butanediol-water mixtures and some tetraalkylammonium iodide salt solutions in these solvent mixtures at different concentrations (0.02 M-0.14 M) have been determined at 298.15 K using magnetic float densitometer technique. Then apparent molar volumes ΦV of the electrolytes in above solvent mixtures were calculated. The apparent molar volumes of transfer ∆ΦV° (tr) were also calculated and the ion-ion / ion- solvent interactions are then discussed on the basis of changes in the Masson's slope and apparent molar volumes of transfer data.