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M. V. Poteshnova, N. M. Zadymova
Peculiarities
of toluene solubilization by polyoxyethylenated nonionic surfactants aqueous
solutions.
Abstract
The equilibrium solubilization
of toluene and octane in aqueous solutions of different classes surfactants (Tween-80,
dodecaoxyethylated para-nonylphenol, sodium dodecyl sulfate, cetylpyridinium
chloride) was investigated by
refractometric and UV-spectrophotometric methods. Peculiarities of toluene
solubilization by polyoxyethylenated nonionic surfactants aqueous solutions
were analyzed when surfactant concentrations are above critical micelle
concentration. It was found that in such case, Tween-80 aqueous
solutions saturated by toluene were Winsor Type I
microemulsions. Different methods of solubilization investigation and various
micellar systems saturation techniques (through gas phase in McBain device, by
mixing of solubilizate and aqueous surfactant solutions, by direct contact of two phases without mixing) were compared. It was shown that refractometric method of
solubilization determination could be used for o/w microemulsions consisting of investigated nonionic surfactants and
toluene.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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