Abstract A model has been developed to describe the combined effects of electrochemical kinetics, ohmic potential drop, and mass transfer for multiple electrochemical reactions at a dropping mercury electrode. The analysis is used to determine the influence of exchange current densities, standard electrode potentials, and operating conditions on the characteristics of differential pulse polarograms for a consecutive EE reaction mechanism. Criteria for the attainment of a separate peak for each reaction are presented. Also, conditions under which standard rate constant can be determined from peak potentials are identified. Results for a consecutive EE mechanism are compared with differential pulse polarograms for a single electrochemical reaction.