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.