Cyclic voltammetry and optical beam deflection (OBD) techniques in dif
ferent electrolytes, KCl, KClO4, CsCl, NaCl, LiClO4, and LiCl, were us
ed to study the ionic exchange processes in polypyrrole (PPy) doped wi
th an anionic surfactant, dodecyl-benzenesulfonate (DBS-). Our results
show the role played by the cations during the first redox process of
the polymer. To compare the OBD curves in each electrolyte, they were
normalized with respect to their dependence on the chemical nature of
the electrolyte. The use of temporal convolution, proposed by Vieil e
t al. (J. Electroanal. Chem., 368 (1994) 183), to relate electrical cu
rrent and angular optical beam deflection, allows the modeling of the
OBD curves and the calculation of apparent diffusion coefficients for
each electrolyte and the diffusion coefficient of each ionic species.