Infinite-Dilution Partition Coefficients for Haloalkane Solutes in Squaiane-Dinonyl Phthalate Solvent Mixtures at 30.0 °C

Using gas-liquid chromatography, we obtained infinite-dilution partition and activity coefficients at 30.0 °C for n-pentane and six haloalkane solutes In pure squalane, in pure dinonyl phthalate, and In five mixtures thereof. Where appropriate the results are contrasted with those from previous studies. Partition coefficients were found to differ by as much as 10% from those calculated from the partition coefficients for the pure single solvents by using the Purnell-Andrade equation. Theoretical expressions derived by Harbison et al. fitted the data within experimental error and were used to calculate Interaction parameters. The results Indicated the existence of a weak 1:1 complex between each of the haloalkane solutes and dinonyl phthalate. The association constants of these complexes were evaluated and their trends were qualitatively interpreted.