Iridium oxide (IrOxs) films formed electrochemically on the surface screen printed (SP) electrode by potential cycling in the range of -0.2 - 1.2 V from a saturated solution of alkaline iridium (III) solution. A strongly adherent deposit of iridium oxide is formed after 5-15 potential scans. Electrochemical and morphological properties of modified SP/electrode were investigated by cyclic voltammetry, atomic force microscopy (AFM) and scanning electron microscopy. Recorded cyclic voltammograms of modified electrode of in wide variety of pH shows a well-defined and reversible redox couple with excellent stability. Microscopic imaging shows deposited film has a very roughness surface that fabricated from iridium oxide nanoparticle next to 50nm. The SP/Iridium-Oxide electrode shows excellent electrocatalytic activity for oxidation of nitrite lon over a wide pH range. The best performance analytical parameters such as detection limit, sensitivity and dynamic linear range were achieved by Flow injection methods. Recording chronoamperograms response of modified electrode in presence of nitrite ions are widely used as an additive in some foods and also as a corrosion inhibitor the determination of nitrite ions is of huge environmental concern. Potato was used as a real sample for determination of nitrite ions and very fine compatibility with other methods proved the ability of sensor.
کلید واژگان :Iridium oxide (IrOxs) screen printed (SP) electrode
ارزش ریالی : 300000 ریال
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