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Authors: LIANA MARIA MUREȘAN, IONEL CĂTĂLIN POPESCU.
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) as function of the Cu(II) concentration (pH 10), was from 10 µM up to 70 µM Cu (II) and the detection limit was 4.74 µM.
Keywords: Cu(II), indigo carmine, differential pulse voltammetry.
