Hydrophobic indicators for two-phase titrations and their application to the determination of silver and pentachlorophenol.
The hydrophobic dyes tetrabromophenolphthalein ethyl ester and 2,6-dichlorophenolindo-phenol are proposed as visual indicators for two-phase titrations. The aqueous phase is colourless throughout the titration and these indicators make it possible to detect the end-point of the titration by the colour of one or the other phase. The indicators allow the two-phase titration of the silver(I)-1,10-phenanthroline complex with tetraphenylborate and of pentachlorophenol with tetraphenylphosphonium chloride.
Tsubouchi
M
M
Laboratory of Chemistry, Kochi Medical School, Oko, Nankoku, Kochi 781-51, Japan.
Yamasaki
N
N
Mitsushio
H
H
Matsuoka
K
K