A d.c. polarographic study has been carried out on the complexes of Co(II), Ni(II) and Zn(II) with procaine in NH4Cl (0.6 M)/borax (0.07 M) buffer solution of pH 8.2. The data obtained indicate that the reduction of Co(II) and Ni(II) ions occur irreversibly in the presence of the chelating agent. The kinetic parameters (αn and K°f,h) of the two complexes were calculated. The study of Zn(II) complex shows a reversible reduction as indicated from the logarithmic analysis. The formed complex is (1:1) (metal:ligand), its formation constant was determined (log K=4.2±0.07).