Novel Sensor Based on Poly (1,2-Diaminoanthraquinone) for Individual and Simultaneous Anodic Stripping Voltammetry of Cd2+, Pb2+, Cu2+ and Hg2+

A novel electrochemical sensor based on glassy carbon electrode (GCE) modified by poly (1,2-diaminoanthraquinone) (P1,2-DAAQ) has been developed for individual and simultaneous determination of Cd2+, Pb2+, Cu2+ and Hg2+ using square wave anodic stripping voltammetry (SWASV). P1,2-DAAQ was characterized by cyclic voltammetry (CV) and scan electron microscope (SEM). Several analytical parameters such as the type of electrolyte solution, polymer film thickness, metal deposition time and deposition potential were investigated and optimized. Optimal conditions were obtained by using five scan cycles for polymer synthesis and 120seconds at -1.6V for metal electrodeposition in acetate buffer solution. Good linear responses to Cd2+, Pb2+, Cu2+ and Hg2+ in the concentration range from 0 to 120g/L were obtained. The limit of detections (LOD) for simultaneous determination of Cd2+, Pb2+, Cu2+ and Hg2+ were 0.3g/L, 0.58g/L, 1.94g/L and 0.26g/L, respectively. The developed method was also applied for their detection in real water samples for which favorable results obtained compared with those obtained using inductively coupled plasma - optical emission spectroscopy (ICP-OES).