Yanadametric Determination of p-Phenylene Diamine

Abstract

Monoamines are estimated by titration with a standard solution of sodium nitrite while m-diamines are determined by titration with a standard solution of a diazo compound. Neither of these methods is useful for the determination of p-phenylene diamine. The older methods for the determination of this substance depend on its oxidation with dichromate in the presence of a~iline to form an indamine. The method is highly sensitive to changes of temperature, dilution, speed of addition of dichromate, etc. Besides, aniline itseff undergoes oxidation to a certain extent.