The effect of surfactants on the stability of polarographic streaming

The frequencies of several vibrational bands of pyridine, pyrazine, p-nitroso dimethylaniline and cyanide adsorbed on a silver electrode have been investigated as a function of the electrode potential using in situ Raman spectroscopy. The frequencies of all the bands investigated were found to decrease linearly with cathodic potential. This observation is independent of the adsorbate and the anions of the supporting electrolyte. Several models explaining this effect are discussed.