Abstract
Adsorption-desorption phenomena of pyridine at a mercury electrode were studied by a flow injection method with mesuring differential capacity-time curves.At more positive potentials than -0.9 V the adso rbed pyridine molecules are never desorbed, which means that the adsorption is irreversible. At -1.35 V a very sharp desorption peak is observed, which means that the adsorption is reversible. Irreversibly adsorped pyridine molecules replace water molecules at the surface of the electrode. Reversibly adsorbed pyridine molecules, which form groups of molecules, are placed on the water molecules at the surface of the electrode. When the groups of pyridine moleculs are desorbed, very large peaks are observed.
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