Ring current of the rotating ring disc electrode system showing the decrease in the oxidation current for the oxidation of superoxide ion radical with the addition of olive oil aliquots.

<p>The experiment consists of sweeping the disk potential from 0.10 V to -1.50 V and then back to 0.10 V while holding the ring potential at -0.25 volts, sufficiently positive to oxidize superoxide back to O₂.</p>