Determination of sulphate content of anionic surfactants: sodium di-2-ethylhexyl sulphosuccinate.
A simple nephelometric method for the determination of sulphates in the anionic surfactant Aerosol-OT is described. The method is based on the formation and stabilization of a barium sulphate dispersion in a water-alcohol mixture and measurement of the turbidity at 650 nm. Beer's law is followed for sodium sulphate concentrations in Aerosol-OT ranging from 0 to 7000 microg/g. The lower determination limit is about 100-200 microg/g and the reproducibility about 5% for typical commercial Aerosol-OT samples. The method can also be used for other anionic surfactants by adjusting the water-ethanol ratio of the solvent.
Tavernier
S M
SM
Department of Chemistry, University of Antwerp (U.I.A.), Universitcitsplein 1, B-2610 Wilrijk, Belgium.
Gijbels
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R