Hydrogen bonding: XXIII. Application of the new solvation equation to log Vg values for solutes on carbonaceous adsorbents

Truncated versions of our new solvation equation can be used to correlate and to predict log V g values for solutes on adsorbents such as Carbotrap, Carbosieve and charcoal cloths. The two truncated equations are log V g = c + rR 2 + llog L 16 and log V t = c + llog L 16, where V g is the retention volume for a series of solutes on a given carbon, R 2 is the solute excess molar refraction, L 16 is the solute gas-liquid partition coefficient on hexadecane at 298 K and c, r and l are constants. The equation in R 2 and log L 16 is shown to be very much better in the correlation of log V g values than previous equations in log (vapour pressure) or in normal boiling point and can reproduce log V g to within 0.4 to 0.9 log units when V g covers range of up to 15 orders of magnitude. The above two equations can be used to select the adsorbent giving rise to the largest V g values for any particular adsorbate for which R 2 and log L 16 are known.