The present work focuses on the study of Pd and Pt sorption using different strains of sulfate reducing bacteria, SRB, (Desulfovibrio spp.) and the comparison of their sorption performance to that obtained using several chitosan derivatives. D. desulfuricans was the best strain: sorption capacities as high as 190 and 90 mg Metal (Me) g-1 for Pd and Pt respectively were obtained under optimum experimental conditions at pH 3. At pH 2, for Pd sorption the maximum sorption capacities with HNO3 and H2SO4 solutions were comparable (close to 120 mg Pd g-1) and higher than the levels reached with HCl solutions (less than 70 mg Pd g-1). Sorption kinetics are very fast: the equilibrium can be reached within the first 15-30 minutes of contact. For chitosan derivatives sorption capacities under selected experimental conditions (i.e. pH 2) appear to be significantly higher than with SRB between 200 and 600 mg Me g-1, depending on the metal and the derivative. However, compared to SRB systems the kinetics are significantly slower: Several hours of contact are necessary to reach the equilibrium.