Current oscillations of indium(III) at a dropping mercury electrode

Oscillations in currents observed at potentials around the polarographic ma ximum during the reduction of indium(III) in potassium nitrate solutions ha ve been characterized. Effects of surfactants, supporting electrolyte conce ntration, mercury drop rate, resistors in series, and temperature are repor ted. The current-time series data of the oscillations obtained by holding t he potential fixed are used to generate a one-dimensional return map. The m inima of adjacent peaks of the oscillations are used for the return map. An alysis of the return map reveals the noise, repeatability of the oscillatio ns, and enhances differences observed in the oscillations between potential settings. (C) 2000 Elsevier Science S.A. All rights reserved.