Spectrophotometric determination of diphenylpyraline with metal indicator NN

Abstract

Spectrophotometric determination of diphenylpyraline with a metal indicator NN has been presented.
Diphenylpyraline reacts with NN [2-Hydroxy-1- (2-hydroxy-4-sulfo-1-napthylazo) -3-naphthoic acid] in acidic medium, whereby the reaction product alone is extractable into organic solvents. The extractability is highest with tetrachloroethane, and the extract shows absorption maxima at 586 and 627mμ.
Examination of fundamental conditions for the determination has revealed that Beer's law is obeyed for 864μg/ml of diphenylpyraline solution.