Determination of tetraphenylborate by two-phase titration with tetraphenylphosphonium salt

Add time:08/24/2019    Source:sciencedirect.com

A visual indicator method has been developed for the titration of tetraphenylborate (TPB) with a 5 × 10−5, M tetraphenylphosphonium (TPP) solution. A hydrophobic dye, tetrabromophenolphthalein ethyl ester (TBPE), is used as an indicator in the presence of 1,2-dichloroethane. The organic phase changes from yellow to blue at the endpoint. This method was applied to the determination of solubility product of TPP perchlorate. The extract of ephedrine, homatropine, perchlorate, or thiocyanate with TPB or TPP was titrated.

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