DETERMINATION OF ANILINE BY ADSORPTIVE STRIPPING VOLTAMMETRY USING ANIMPROVED DIAZOTIZATION AND COUPLING PROCEDURE - APPLICATION TO THE EVALUATION OF THE LIGHT DEGRADATION OF D-AND-C RED-NO-33 IN THE PRESENCEOF ASCORBIC-ACID

A method for the determination of aniline was developed, based on the diazotization and coupling of the aromatic amine to form an azo compou nd capable of being determined by adsorptive stripping voltammetry. A fast derivatization procedure was developed using 1-naftol as the coup ling agent. A detection limit of 0.8 mu g/l was obtained for aniline, using an accumulation time of 2 min. The method was applied in the det ermination of the amount of aniline in the colouring matter D&C Red No . 33, after a liquid-liquid extraction with chloroform, before and aft er submitting the colouring matter to a process of degradation, using accelerated light conditions in the presence of ascorbic acid.