The theory and practice of oscillog. chronopotentiometric titrns. using feed-back current are presented. In ordinary oscillog. titrns., charging current is very large in comparison with the Faradaic current. Since the charging current is proportional to dE/dt, it is possible to compensate it by feeding a current proportional to dE/dt back into the electrolytic cell. In such a way, the incision of depolarizers becomes more sensitive and the end-point detection is much sharper. Many titrns. that can not be done in ordinary oscillog. chronopotentiometric titrns. can be carried out with feed-back current technique.

Key words: OSCILLOSCOPIC POLAROGRAPHY, TITRATION, NICKING, ELECTRIC CURRENT, FEEDBACK CONTROL, DEPOLARIZER