Chemistry Department, Faculty of Samos, Assiut University, Assiut, Egypt Chemistry Department, Faculty of Science, Assiut University, Qene, Egypt Manuscript mewed 25 February 1988, revised 20 June 1988, accepted 12 October 1988 The polarographic reduction of BIIII, FeIII, HgII, CuII and UO2II at the dropping mercury electrode has been investigated in pyruvate solution. A single-reduction wave has been observed with each metal Ion. It has been proved that pyruvate forms com­plexes of the type 1

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... 1 and 2 : 1 ligand to metal ratio with FeIII and Uo2II and 1 : 1 ligand to metal complexes with BiIII, HgII and CuII. The stability constants have been determined. The effect of pH, the nature of the electrode process and the reduc­tion mechanism have been discussed. The stoichiometry of the complexes has been confirmed by conductometric titration.