Diffusion coefficient of oxygen in propylene glycol-water mixtures and glycerol-water mixtures

Abstract

In order to obtain diffusion coefficient of oxygen at various concentrations of propylene glycol-water and glycerol-water mixture, polarographic examination of these mixtures was made. The diffusion coefficient of propylene glycol-water mixture calculated by interpolation of measured values in the Ilkovic formula was greater than the values obtained from the Stokes-Einstein or Wilke formula and the difference became greater, the higher the concentration, with the minimum point at around 70-80%. In the glycerol-water mixture, the values by any of these formulae agreed well and the diffusion coefficient decreased with increasing concentration. These facts suggest that a specific association occurred in the propylene glycol-water mixture from around 50-60% and some sudden change had taken place in the internal structure.