STREAMING MAXIMA IN THE IODINE ELECTROREDUCTION AT HG ELECTRODES IN DMSO SOLUTIONS

A current maximum was observed by d.c. polarography during the electroreduction of iodine at Hg electrodes in DMSO solutions. i-t curves during the drop life were performed to characterize the observed maxima. Changes in the cation of the supporting electrolyte do not. appreciably affect the results. The dependence of the streaming with depolarizer and supporting electrolyte concentration, as well as its independence of flux rate confirmed by linear sweep potential experiments at a hanging mercury electrode, permit us to classify the streaming under study as a positive first kind streaming. Regular current fluctuations at a certain depolarizer concentration and low supporting electrolyte concentration are also reported. © 1979 Elsevier Sequoia S.A., Lausanne.