This paper presents the experimental behavior of the interfacial charge-potential (Q(s)/E) and capacitance-potential (C-s/E) responses obtained for quinizarine (1, 4-dihydroxyanthraquinone) monolayers on mercury in aqueous acidic solutions, by using chronopotentiometry and derivative Chronopotentiometry with programmed (DCP) and constant currents (CC) and cyclic voltammetry (CV). The results obtained have been compared with previously obtained theoretical expressions for the Q(s)/E and C-s/E curves of reversible redox monolayers [J. Electroanal. Chem., 557 (2003) 157]. in which non-faradaic effects have been taken into account. We have found a good agreement between theory and experimental data although the Q(s)/E and C-s/E curves obtained from chronopotentiometric techniques are more suitable than those corresponding to cyclic voltammetry. Accurate values of the surface redox potential, total excess, and capacitance (C-s) of quinizarine monolayers have been obtained. (C) 2003 Elsevier Ltd. All rights reserved.