By Sunil Bhardwaj

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Polarography is the technique with the help of which we can have qualitative as well as quantitative analysis. In Polarography, we apply different potential every time across the electrodes and for each potential applied we find out current. Then we plot a graph of current V/S potapplied. The graph obtained is Polarogram, which is in the form of wave. The wave obtained often contains maxima OR Hump, which increases the true height of wave. That increase in the height is known as Hump or Maxima. The reason for maxima is not completely understood. But most accepted theory is it arises due to adsorption of impurities on D.M.E. Because impurities present in the electrolyte may be reduced along with metallic ions, as the reduction potential is same or nearly same potential (volts). The maxima can be suppressed or eliminated by adding small amount of surfactants like gelatin, methyl red or nonionic detergent such as Triton X100. This Triton X100 is powerful suppressor. One ml of this is sufficient for 10 ml of Polarographic solution.

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