The voltammetric behavior of cadmium dodecyl sulfate micelles in aqueous NaCl and NaNO3 solutions has been examined. In conjunction with potentiometric and conductance measurements, the critical micelle concentrations (CMC’s) and apparent cadmium diffusion coefficients have been determined. The CMC’s are not greatly affected by salt concentration up to 0.1 M. The apparent diffusion coefficients are satisfactorily accounted for by a two-layer diffusion model involving both micellar-bound and free cadmium(II) transport.