1962 年 11 巻 6 号 p. 309-312
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.