The Thermodynamics of Chromatography - Interactions Between the Atoms of Hydrogen, Carbon, Chlorine and Bromine and an Exclusively Dispersive Stationary Phase > Experimental Data > Page 31


               = DG'C+ DG'Cl+  3DG'H+ n(DG'Br+ DG'H)               (22)

Equations (19), (20), (21) are linear functions of (n) and thus, curves of Log(K), taken at a given temperature, against (n) for a series of substituted methanes will give a straight line with slopes and intercepts that are predicted by equations (19), (20) and (21).



Experimental Data

The data of Martire et al. (8) are included in table (1). The actual data published was the specific retention volume of each solute at four different temperatures, 30˚C, 40˚C, 50˚C and 60˚C respectively and was reported to have been determined with a precision of better than +/-2%. However, by multiplying each specific retention volume by the density of the stationary phase (n-octadecane) at the respective temperature, the retention volume per ml of each solute could be obtained which is numerically equal to the distribution coefficient (see Gas Chromatography).