Author/Authors :
?krivanj، Sandra نويسنده Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia ?krivanj, Sandra , Stankovi?، Dalibor M نويسنده Innovation Centre of the Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia Stankovi?, Dalibor M , Khan، Muslim نويسنده Institute of Chemistry – Analytical Chemistry, Karl-Franzens Universit?t Graz, A-8010 Graz, Austria Khan, Muslim , Nikoli?، Aleksandar S نويسنده Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia Nikoli?, Aleksandar S , Vuli?، Predrag نويسنده Faculty of Mining and Geology, Djusina 7, 11000 Belgrade, Serbia Vuli?, Predrag , Manojlovi?، Dragan Dragan D نويسنده Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia Manojlovi?, Dragan D
Abstract :
This paper describes determination of trace level of copper ions on a new type of modified glassy carbon paste electrode based on addition of different amount of Co-ferrites in glassy carbon paste (CoFeMGCPE). Co-ferrite nanoparticles with different amount of cobalt were synthesized and characterized using scanning electron microscopy (SEM) and X-ray powder diffraction (XRPD). A significant increase in current was achieved by introducing modifier in composition of the electrode in comparison with the bare glassy carbon paste electrode. Electrochemical parameters such as percentage of modifier, accumulation time and potential, pH and the optimized amount of cobalt in the ferrites were determined. The best voltammetric response was observed for Co0.5Fe0.5Fe2O4 when percentage of modifier was 3%. In acetate buffer solution, pH 4.5, thus prepared electrode displays selective detection toward copper ions, detection limit of 96 nM and it was successfully applied for the determination of copper ions in natural water samples, with satisfactory recovery
