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A catalytic polarographic method for the determination of microgram quantities of Ce(IV) is developed based on the catalytic currents of cerium(IV) in the presence of NH 4 Cl-NH 4 OH at pH 6.2 with piperazine. Piperazine produces catalytic current with Ce(IV) at peak potential-0.1 to-0.6 V vs. SCE. The procedure was applied for the estimation of Ce(IV) in water samples. The method is simple, sensitive and free from interference of many metal ions.

Abstract:Two new ligands, ammonium 2,6-dimethyl morpholine dithiocarbamate (ADMM-DTC) and ammonium 3-methyl piperdine dithiocarbamate (AMP-DTC) were synthesized in the laboratory. The method was based on chelation of manganese(II) with ADMM-DTC/AMP-DTC in the presence of NH 4 OH at pH 6.2 and 6.8 to produce catalytic hydrogen currents at -0.72 V and -0.62 V vs. SCE respectively and prior detected by D.C poarography. Optimized polarographic conditions were established by studying effect of pH, supporting electrolyte (NH 4 Cl), ligand and metal ion concentrations and effect of adverse ions on peak height to improve the sensitivity, selectivity and detection limits of the present method. This technique is successfully applied for the analysis of manganese(II) in different matrices with recoveries ranging from 97 -99% and the results obtained were comparable with the differential pulse polarography (DPP).