2.1. Apparatus
The voltammograms were recorded with a
PRG-3 polarograph and an EPL-2 recorder
(Tacussel Electronique). A saturated calomel elec-
trode (SCE) and a platinum wire electrode were
used as reference and counter electrodes, respec-
tively. The working electrode was a glassy carbon
stationary electrode (Tacussel XM 540, area 1.013
cm2
). For comparison studies, a platinum wire
electrode (Tacussel, diameter 1 mm, height 15.7
mm) was used. A Wenking model HP 70 poten-