Polarography of bismuth in oxalate and thiourea media

The polarography of bismuth in the presence of thiourea and oxalate is discussed. Measurements could not be made in thiourea medium due to the dissolution of mercury. The reduction was irreversible in oxalate medium and the kinetic parameters as well as the stability constant of the predominant species were calculated from the formal potentials measured by amalgam polarography. The mixed complexes were not formed and the reduction was quasi-reversible in the presence of both the ligands.