scholarly journals Salting-out of triethylphosphate by inorganic electrolytes

1984 ◽  
Vol 62 (1) ◽  
pp. 81-85 ◽  
Author(s):  
Norman H. Sagert ◽  
Danny W. P. Lau
Keyword(s):  
Distribution Theory ◽  
Experimental Results ◽  
Scaled Particle Theory ◽  
Particle Theory ◽  
Additive Property ◽  
Salting Out ◽  
Molecular Parameters ◽  
Order Of Magnitude

The salting-out of triethylphosphate (TEP) from water was measured at 25 °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 [Formula: see text] for anions and [Formula: see text] 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.

Application of scaled particle theory to the salting out of single hydrophobic ions

1990 ◽  
Vol 86 (6) ◽  
pp. 931-936 ◽  
Author(s):  
Anna-Kaisa Kontturi ◽  
Kyösti Kontturi ◽  
Lasse Murtomäki ◽  
David J. Schiffrin
Keyword(s):  
Scaled Particle Theory ◽  
Particle Theory ◽  
Salting Out ◽  
Hydrophobic Ions

A surface tension approach to the salting-out of nonpolar nonelectrolytes

1982 ◽  
Vol 60 (11) ◽  
pp. 1317-1326 ◽  
Author(s):  
Robert Aveyard
Keyword(s):  
Surface Tension ◽  
Salt Solution ◽  
Standard Free Energy ◽  
Scaled Particle Theory ◽  
Salt Effects ◽  
Salting Out ◽  
Polar Solutes ◽  
Order Of Magnitude ◽  
Free Energy Of Transfer ◽  
Energy Of Transfer

A simple approach is developed for the salting-out of nonpolar molecules by strongly solvated salts. The standard free energy of transfer of solute from pure solvent to salt solution, and hence the salting coefficient, k, is calculated in terms of the surface tension increment caused by the addition of salt to the solvent. In its simplest form the method gives k in terms of the molar volumes of solvent and solute, and the osmotic coefficient of the salt solution. It is more successful in the prediction of k than the McDevit and Long theory, and it also has advantages over the more complex scaled particle theory of salt effects. In addition to a range of nonpolar solutes, the salt effects on some alcohols are also considered but application to polar solutes generally requires a knowledge of experimentally determined surface tension increments which are not widely available. The correct order of magnitude for the temperature coefficient of k at room temperature for some alkanes and H2 in water is given, although minima in k as a function of temperature, which have sometimes been observed, are not reproduced.

scholarly journals Use of scaled-particle theory in the assessment of the Ph4As+/Ph4B− assumption for single ions

1979 ◽  
Vol 57 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Michael H. Abraham ◽  
Asadollah Nasehzadeh
Keyword(s):  
Free Energy ◽  
Recent Work ◽  
Scaled Particle Theory ◽  
Cavity Formation ◽  
Energy Term ◽  
Free Energies ◽  
Particle Theory ◽  
Novel Method ◽  
Energy Of Interaction ◽  
Solvent Molecules

A novel method for the assessment of the Ph4As+/Ph4B− assumption for free energies of transfer of single ions has recently been suggested by Treiner, and used by him to deduce that the assumption is not valid for transfers between water, propylene carbonate, sulpholane, dimethylsulphoxide, N-methyl-2-pyrrolidone, and perhaps also dimethylformamide. The basis of the method is the estimation of the free energy of cavity formation by scaled-particle theory, together with the hypothesis that the free energy of interaction of Ph4As+ (or Ph4B−) with solvent molecules is the same in all solvents, ΔGt0(int) = 0. It is shown in the present paper that (a) whether or not the Ph4As+/Ph4B− assumption applies to transfer to a given solvent depends on which other solvent is taken as the reference solvent in Treiner's method, (b) the calculation of the cavity free energy term by scaled-particle theory and by the theory of Sinanoglu – Reisse – Moura Ramos (SRMR) yields values so different that the method cannot be considered reliable, (c) the calculation of cavity enthalpies and entropies for Ph4As+ or Ph4B− by scaled-particle theory yields results that are chemically not reasonable, (d) the hypothesis that ΔGt0(int) = 0 conflicts with SRMR theory, and (e) the conclusions reached by Treiner are not in accord with recent work that in general supports the Ph4As+/Ph4B− assumption for solvents that are rejected by Treiner.

Spectroscopie par Source Laser. IV. Application de la Théorie d'Anderson au Calcul des Largeurs des Raies de la Transition 10°0–00°1 de N2O. Influence de l'Octupôle sur la Détermination du Moment Quadrupolaire de N2O

1973 ◽  
Vol 51 (6) ◽  
pp. 605-609 ◽  
Author(s):  
C. Boulet ◽  
N. Lacome ◽  
P. Isnard
Keyword(s):  
Quadrupole Moment ◽  
Experimental Results ◽  
Molecular Parameters ◽  
Line Widths

From the analysis of the available experimental results, a vibrational dependence of N2O line widths is shown, which can be explained, applying the Anderson–Tsao–Curnutte theory. But no dependence on ν of any of the molecular parameters can be deduced. In the last part, we have pointed out the effect on the determination of the quadrupole moment of assuming a nonvanishing octupole moment for N2O.

Sign in / Sign up

Export Citation Format

Share Document