A Sensitive Zinc Ion Electrode Based on Electrochemically Deposited Ethylene Diamine Tetra Acetic onto Glassy Carbon Surface

Abstract

The current work was interested in the elaboration of a new electrochemical sensor based on modified glassy carbon electrode for zinc detection. For this 4-para nitrobenzene diazonium (P-NBD), 4-nitrophenyl (NP) and 4-aminophenyl (AP), and ethylene diamine tetra acetic (EDTA) were electrochemically deposited from aqueous solution on the surface of glassy carbon (GC) electrode by potential cycling in the range between 0.4 and ¹1.25 V. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Square wave voltammetry (SWV) were used to characterize the GC sensor. We show that the Zinc ion sensor based on modified CG electrode was characterized by low limit of detection (LOD) for about 3.74 10 ¹11 g L ¹1 , high sensitivity and wide linear detection range between 2.5 10 ¹12 g L ¹1 and 2.0 10 ¹07 g L ¹1. This proposed sensor gave satisfactory results in determination of zinc in water and can be successfully used in the detection of real water samples.