Curve 1: Degradation in the undivided cell; Curve 2:
degradation in the anodic compartment of divided cell in the presence of Fe2+;
Curve 3: degradation after reversing the electrode polarity under condition 2; Curve
4: degradation in the cathodic compartment of divided cell in the absence of Fe2+
and O2; Curve 5: degradation in the undivided cell after scavenging strong ROS by
addition of 60 mM methanol. Unless otherwise specified