Determination of silver(I) by cyclic voltammetry at iodine-coated electrodes

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Abstract
Voltammetric investigations on iodine-coated platinum electrodes have revealed their remarkable inertness towards molecular adsorption, which means suppression of surface processes, interferences and generally the current background in voltammetric measurements. Iodine-coated platinum electrodes were prepared by potentiostatic adsorption of iodine at 0.20 V from 1 mmol l–1 KI solution in 0.5 mol l–1 H2SO4. The passive potential window (the working potential range) in 0.5 mol l–1 H2SO4 is approximately from –0.10 to 0.95 V. Voltammetric measurements of Ag+ on the iodine-coated electrode revealed the existence of a linear relationship between the anodic peak current and the bulk concentration of silver ions. The detection limit was 5.7 × 10–6 mol l–1. The calibration graph had a slope of 7.58 × 105µA mol–1 l over a working range from 1 × 10–5 to 1 × 10–3 mol l–1 with a correlation coefficient of 0.9997.

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