Electroanalysis of Ag+, Hg2+ and Fe2+ by Voltammetry at an Iodine Coated Platinum Electrode PDF

Keywords

electrode, iodine, platinum, electroanalysis

Abstract

Voltammetric investigations on iodine-coated platinum electrodes revealed their remarkable inertness towards molecular absorption, which means suppression of surface processes, interferences and generally the current background in voltammetric measurements. In the present work, iodine-coated platinum electrodes were prepared by potentiostatic adsorption of iodine at 0.20 V from 1mM KI solution in 1.0 M HClO4. The passive potential window (the working potential range) in 1.0 M HClO4 was approximately from 0.20 to 0.9 V. Electroanalysis of Ag+, Hg2+ and Fe3+ by cyclic voltammetry showed the existence of a linear relationship between the peak current on the E-i curves and the bulk concentration of the ions