The Thermodynamics of Chromatography - The Thermodynamic Analysis of the Dispersive Interactions that Can Take Place between Different Solutes and High Molecular Weigh > Page 19

The slopes (the standard energy contribution of one methylene group,  and half the intercept (the contribution from one terminal methyl groups, ) is now plotted against the reciprocal of the absolute temperature to determine the standard enthalpy and standard entropy of the dispersive interaction of the methyl and methylene groups with the stationary phase. The curves obtained are shown in figure 9.

 

 

 

Figure 9. Graph of Intercepts and Slopes from Figure 8 against the Reciprocal of the Absolute Temperature