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Cyclic and differential pulse voltammetry investigations of an iodine contrast product using microelectrode of BDD

Koffi Konan Konan, Foffié Thiery Auguste Appia, Kouadio Kouakou Etienne, Kimou Kouakou Jocelin, Kone Souleymane, Ouattara Lassiné


This work deals with the electrochemical behavior and detection of an iodine contrast product using microelectrode. For this, cyclic voltammetry and differential pulse were used for behavior study and detection, respectively. In this work, a boron-doped diamond (BDD) microelectrode was used. Cyclic voltammetry showed that the oxidation peak of iohexol (IHX) appeared at a potential of 1.655 V/ESM in H2SO4 medium (0.1 M).  The electrooxidation process of IHX is irreversible, controlled by diffusion combined par adsorption, and can undergo direct and/or indirect oxidation. In addition, using the differential pulse voltammetry technique, the peak oxidation current shows a linear relationship with the IHX concentration between 4 µmol/L and 74.35 µ mol/L. The calculated limit of detection (LOD) and limit of quantification (LOQ) are 1.953 µmol/L and 6.511 µmol/L, respectively. Recovery rates ranging from 95% to 99% in the presence of interfering compounds (inorganic compounds with concentrations 300 times higher than that of IHX). In addition, the DDB successfully recovered the concentration (20 µmol/L) of IHX dissolved with paracetamol concentrations ranging from 31 µmol/L to 149.66 µmol/L. These results suggest that the BDD can be used as a practical sensor to detect and quantify trace amounts of IHX.

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