FERRIC ION-SELECTIVE ELECTRODE BASED ON GRAPHITE CARBON ELECTRODE

A spectroscopic graphite carbon electrode evaluated as a ferric ion se lective electrode is described. The electrode response characteristics were investigated by potentiometry, cyclic voltammetry, ESR and SEM. It is possible that the electrode potential change results from the ad sorption of Fe(III) and consequent reduction on the electrode surface. A linear response in concentration range from 5 x 10(-5) to 1x10(-3) M was obtained in 0.1 M H2SO4 solution with detection limit of 1 x 10( -6) M for the determination of Fe(III) ion. Th; electrode shows a good selectivity for Fe(III) except For Ag(I). The new electrode has advan tages of being highly sensitive, inexpensive and easy to use.