The solubilization of toluene Into water by propylene glycol and methanol was measured by a novel liquid chromatographic procedure. The relationship between solubilization and cosolvent content Is linear up to 10-20 vol % of cosolvent, beyond which conventional logarithmic behavior Is observed. The point of departure from linearity Is believed to signal the onset of Interaction between the extended hydration shells of the cosolvent. For propylene glycol, the volume of this shell Is about 500 mL/mol, and the solubility of toluene within the shell Is about 1.3 times Its solubility In pure water.
ASJC Scopus subject areas
- Analytical Chemistry