Abstract
When melamine is added to a neutral de-aerated solution of potassium nitrate, it distorts the positive side as well as the negative side of the electrocapillary curves of mercury. It also causes a major shift in the electrocapillary maximum (ECM) towards negative potentials. Melamine is adsorbed in its planar orientation on the positively charged mercury surface. On the negatively charged mercury surface, melamine possibly acts as a depolarizer and hence catalyzes the hydrogen evolution reaction. Melamine also acts as a suppressor to positive (lead, copper) as well as negative (aluminum, nickel) maxima as it is adsorbed at the interface between the dropping mercury electrode (DME) and the electrolyte.
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