N, N′-dimethylformamide was used as solvent with a high degree of polarity, ammonium acetate solution as supporting electrolyte, and gelatin solution as maxima suppressor, to determine polarographically anthraquinone, aminoanthraquinone, and naphthaquinone. After removing oxygen by bubbling the solution with an inert gas, the mentioned compounds were reduced at different polarization potentials, giving 3 reduction steps relative to the mercury dropping electrode.