Studies on the Analysis of Surface Active Agents. XVII.

Analysis of the Surfactants Mixtures. 3, Direct Titration of Cationics in the Cationics·Ampholytics·Nonionics Ternary System by “Semimicro Bromophenol Blue-Dichlorethane”

Abstract

For the direct analysis of cationics in binary or ternary surfactants mixtures, the determination of cationics in the mixtures by “Bromophenol Blue-Dichlorethane” method has been investigated.
The anionics standard solution is titrated with the sample solution containing cationics by using Bromophenol blue (BPB) as an indicator.
The end point is reached when the indicator shifts from the water to the solvent (DCE) phase.
The experimental results with various binary or ternary mixtures showed that ampholytics and nonionics had no influence on the titration by adjusting pH at 9.812, and that cationics in the mixtures could be directly titrated with satisfactory accuracy by “BPB-DCE” method.