Abstract
The adsorption of octadecyltrimethyl ammonium bromide (ODTABr) at the mercury electrode surface and the influence of the adsorbed layer upon the electrode reduction of cadmium were studied by electrochemical methods. The adsorption processes have been investigated in the presence of electrolytes of different surface activities, namely NaCl and NaClO 4. The adsorbed layer of ODTABr on a NaClO 4 subphase showed a simple blocking effect by inhibiting the electrode reduction of cadmium. However, accumulation of cadmium in the adsorbed layer of ODTABr has been observed in NACl solutions and attributed to the adsorption of its unchanged complex species CdCl 2 at the electrode surface modified by adsorbed ODTA + Cl − ionic pairs. In comparison with the model, the stability constant of the surface complex (ODTA + Cl − -CdCl 2)° ads was estimated to be λ 2 = 1.9 × 10 4 dm 3 mol −1.
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