Results of coupled voltammetric and EQCM studies were compared with those of radiotracer (voltradiometric) investigations of anion adsorption (HSO4-, Cl-) at a rhodized electrode. The coincidence of the position of the peaks of voltammetric, differential voltradiometric and df/dE vs. E curves (E=potential, f=frequency) indicates that the EQCM measurements furnish reliable information on the anion specific adsorption.