DETERMINATION OF TRACE AMOUNTS OF CARCINOGENIC SUBSTANCES - ADSORPTIVE STRIPPING VOLTAMMETRY OF 1-[4'-(PHENYLAZO)PHENYL]-3,3-DIMETHYLTRIAZENE AT A HANGING MERCURY DROP ELECTRODE

1-[4'-(Phenylazo)phenyl]-3,3-dimethyltriazene can be determined in the range from 1 x 10(-5) to 2 x 10(-7) mol dm-3 by direct current or differential-pulse voltammetry at a hanging mercury drop electrode. Direct current adsorptive stripping voltammetry can be used in the range from 2 x 10(-8) to 10 x 10(-8) mol dm-3 and differential-pulse adsorptive stripping voltammetry in the range from 1 x 10(-8) to 2 x 10(-11) mol dm-3. The extremely high sensitivity in the latter instance was achieved by using 200-fold diluted Britton-Robinson buffer as a base electrolyte together with a long accumulation time (up to 30 min at 1 x 10(-11) mol dm-3). The relative standard deviation (seven determinations at 2 x 10(-11) mol dm-3) was 8.6%.