Graphite electrode modified with Indigo Carmine for Cu(II) ions detection
1 Ecole Normale Supérieure, Laboratoire des Sciences Physiques Fondamentales et Appliquées, 08 BP 10 Abidjan, CÔTE D’IVOIRE
2 Babeş-Bolyai University, Faculty of Chemistry and Chemical Engineering, Department of Physical Chemistry, 11, Arany Janos St., RO-400028 Cluj-Napoca, ROMANIA
An electrochemical method for Cu(II) determination, based on its reaction with indigo carmine (IC) in alkaline medium and differential pulse voltammetry performed at graphite electrode, was elaborated. The experimental parameters affecting the Cu(II) - IC complex formation (reaction time and pH) were optimized. The linear range of the calibration curve, obtaining by representing the IC oxidation current (Eappl = 0.175 V vs. Ag/AgCl,KClsat) versus the Cu(II) concentration (pH 10), was from 10 μM up to 70 μM Cu (II) and the detection limit was 4.74 μM.
Key words: Cu(II) / indigo carmine / differential pulse voltammetry
© Owned by the authors, published by EDP Sciences, 2014
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