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The influence of the tetrabutyl ammonium cation (TBuA + ) on the redox behaviour of the CdfHgyCd(II) couple in 1M chloride media was examined using differential pulse and cyclic voltam merry techniques. It was found that at low scan rates (tens to hundreds of mV/s) and with an increase in tetra bury lammonium cation concentration, some results from both techniques are consistent with observations made in classic polarographic studies (e.g. the increase in tetiabutylammonium ion concentration in a solution containing the cadmium(U) ion, in chloride media, promotes a similar decrease in the cathodic current intensity of the metallic cation). At higher scan rates, the results of cyclic voltammetry experiments are suprisingly different. Among various effects observed, the presence of the tetrabutylammonium cation, below a certain concentration, seems to have no effect on the electroieduction of cadmium(ll) ions.