الفهرس | Only 14 pages are availabe for public view |
Abstract The current thesis is aimed to fabricate new modified electrodes for anodic stripping voltammetry of some heavy metals using simple electrochemical methods as alternatives to traditional spectrophotometric techniques which are very complicated, very expensive and couldn’t be used for in field measurements in contrast our proposed methods distinguished with many advantages summarize in its simplicity and the ability for using for on field measurements. 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 Square wave voltammetry (SWV) and scanning 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 120 seconds at –1.6 V for metal electrodeposition in acetate buffer solution. Good linear responses to Cd2+, Pb2+, Cu2+ and Hg2+ in the concentration range 0 to 120 µg/L were obtained. The limit of detections (LOD) for simultaneous determination of Cd2+, Pb2+, Cu2+ and Hg2+ were 0.3 µg/L, 0.58 µg/L, 1.94 µg/L and 0.26 µg/L, respectively. The developed method was also applied for the detection of them in real water samples for which favourable results obtained as compared to results obtained using inductively coupled plasma – optical emission spectroscopy (ICP-OES). |