Surface Complexation of Copper(II) with Alizarin Red S Adsorbed on a Graphite Electrode and Its Possible Application in Electroanalysis

Abstract

Alizarin red S (ARS) has been used previously as a spectrophotometric reagent for several metals. It has been also employed as an electrode modi®er agent for voltammetric analysis. With the purpose of studying the electrochemistry of the adsorbed ARS ligand and the surface ARS-copper(II) complex, on the pyrolytic graphite electrode, cyclic voltammetric experiments were carried out in open and closed circuits. The results indicate that ARS is strongly and irreversibly adsorbed on the electrode surface. This adsorption process was employed to immobilize, by complexation, copper ions from the solution, and for a possible application of the ARS modi®ed electrode in trace copper electroanalysis are explored in this article. The optimization for trace copper determination in aqueous solution was accomplished by anodic stripping voltammetric technique (differential pulse mode); the preconcentration potential was 7 0.40 V; pH was 5.3 and accumulation time was 2 minutes. Under these conditions, the detection limit was 1.7610 78 mol L 71, and a linear range from 1.0610 77 to 4.0610 76 mol L 71.

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“…Here, P 1 and P 2 correspond to the step-wise one electron reduction from Cu(II) to Cu(I), and from Cu(I) to Cu(0), respectively, while P 3 corresponds to two electron oxidation from Cu(0) to Cu(II). Similar electrochemical behavior has been reported for CuSO 4 solution [17] and copper electrodes [11,12]. Fig.…”

Kinetic, equilibrium, thermodynamic studies and spectroscopic analysis of Alizarin Red S removal by mustard husk

“…Ghaedi et al [20] used multiwalled carbon nanotubes as adsorbents for the kinetic and equilibrium study of the removal of Alizarin Red S. Li et al [21] analyzed the adsorption voltammetry of the mix-polynuclear complex of zirconium-calcium-Alizarin Red S at a carbon paste electrode. Filho et al [22] investigated the surface complexation of copper(II) with Alizarin Red S adsorbed on a graphite electrode. Kurepa et al [23] worked on the uptake and distribution of ultrasmallanatase TiO 2 Alizarin Red S nanoconjugates in Arabidopsis thaliana.…”

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