A possibility of determining various types of amines by their inhibiti
ng or promoting effects on the copper(ll)-catalyzed oxidation of hydro
quinone with hydrogen peroxide is discussed. A procedure for determini
ng imidazole by its inhibiting effect in the hydroquinone-Cu(II)H2O2 r
eaction is developed. The detection limit for imidazole is found to be
5.6 ng/mL.