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Natural phosphate -modified carbon-paste electrode for the determination of traceCu (II) by square-wave voltammetry

Tarik ElOuafy,Abdelilah Chtaini,HassanOulfajrite, Rachida Najih

The electrochemical behavior of copper ions at natural phosphate modified carbon paste electrode (NP-CPE) is reported. The electrode paste was prepared as a mixture of finely powdered natural phosphate (NP) together with graphite powder. The influence of variables such as the accumulation time, pH solution, scan rate and concentration tested by cyclic and square wave voltammetry. The best results were obtained under the following optimized conditions: 3 min accumulation time. The electrochemical responses obtained by square wave voltammetry (SWV) and cyclic voltammetry (CV) at NP-CPE were found to be analytically suitable to develop a method for the determination of Cu(II) at low concentration levels. The proposed sensor presented good repeatability, and was applied for cooper determination in tap water samples.