Titrations with the Rotating Platinum Electrode:
Mercury cannot be used as electrode at positive potentials since of its oxidation and therefore rotating platinum electrode at 600 revolutions per minute is used. With platinum as electrode, an attainment of steady state diffusion current is slow and one has to wait for a considerable time after every addition of the reagent and thus platinum electrode is rotated. The construction of electrode is given below.
Figure: Rotating platinum electrode