Salting-out of triethylphosphate by inorganic electrolytes

The salting-out of triethylphosphate (TEP) from water was measured at 25 degrees C for twelve inorganic electrolytes. If salting out is taken as an additive property of ions, then the effectiveness for salting TEP out of water is I- < Br- < Cl- < 1/2SO42- <1/2CO32- for anions and 1/3La3+ < Na+ approximately NH4+ < Cs+ < 1/2Mg2+ < K+ < 1/2Ba2+ for cations. The results were fitted to three theories. The distribution theory of Conway, Desnoyers, and Smith predicts the order of magnitude of the experimental results, but does not discriminate well between salts of the same valence type. The electrostriction theory of McDevit and Long discriminates well between ions but gives results three or five times larger than those observed. Scaled particle theory predicts the results reasonably well, but the predictions depend critically on the choice of ionic and molecular parameters. Thus, none of these theories is entirely satisfactory