Dilute aqueous solutions, generated or used by industry, can contain a variety of different metal ions. Various processes are suitable for reclamation of heavy metals and among them, biosorption constitutes an alternative. The ability of microorganisms to remove metal ions from solution is a well known phenomenon. Applications of biosorption make use of dead biomass, which does not require nutrients and can be exposed to environments of high toxicity. Focus of this paper constitutes, among other, the kinetics of the biosorption process that is still quite ambiguous; as example, the use of Aeromonas caviae is given for the removal of cadmium or chromate ions in a stirred batch reactor. The Elovich rate equation has been applied to the experimental data in the present and critically commented in comparison with the literature.