Polarography. Polarography is another form of linear/sweep voltammetry where the electrode potential is programmed over a specific voltage range. The unique nature of polarography is that it employs a dropping mercury electrode (the working electrode) and a stationary mercury anode (basically a stream of mercury drops (the cathode) that fall into a static pool of mercury (the anode)). The surface of the electrode is constantly renewed under dropping conditions and, thus, the conditions under which reaction takes place are readily reproducible. The trace relating current to potential shows a series of peaks (each peak produced by a falling drop) and the height of each peak is modified as the applied potential is changed. The peak maxima for each drop will trace out the usual sigmoid shape.

Further Information on this Topic can be found in the books of R.P.W. Scott by following the listed links