ELECTRONIC CONFIGURATIONS IN POTENTIOSTATS FOR THE CORRECTION OF OHMIC LOSSES

Recent trends in the design of potentiostats capable of correcting for ohmic losses occurring in electrochemical cells are reviewed. The var ious effects of ohmic drop occurrence and their influence on diverse e lectroanalytical techniques are considered, as well as potentiostat co nfigurations and stability, with emphasis in the three-electrode cell configuration. Electronic correction methods are discussed according t o the following classifications: (1) positive feedback, (2) negative i mpedance, (3) current pulse, (4) analogic subtraction, and (5) current interruption.