Square Wave Polarography/Voltammetry:

This is a category of pulse polarography that offers the advantages of high sensitivity, great speed and low detection limit. The whole voltammogram is obtained in less than 10 ms. it uses a potential wave form similar to one used in DPP and the entire potential sequence is applied during the life time of a single drop. This can be used with DME and HMDE. The excitation signal within this method is obtained by superimposing the pulse shown on to the stair case signal. The length of each step in stair case signal is synchronized with the pulse period (τ) and is about 5 ms. the potential step is 10 mv (?E_s). The magnitude of the pulse is often 50 mv. Under these conditions corresponding to a pulse frequency of 200 Hz, a 1-V scan requires 0.5 s.