Abstract:
Modification the bismuth nanoparticles (Spheres and Rods)onto glassy carbon electrode as a working electrode has been developed and applied for heavy metal analysis (Zinc, Cadmium and Lead) by square-wave anodic stripping voltammetric technique. The optimization of synthesis the nanobismut spheres and bismuth rods) was investigated. The morphology and structure of the nanoparticles were analyzed with a scanning electron microscope (SEM) . The under optimal conditions, the size of synthesize nanobismuth spheres and bismuth rods were 137.0 ± 3.43 nm และ 5.18 ± 1.36 nm, respectively. For the heavy metal analysis using the modify electrode, it was observed that the optimal conditions of deposition potential and deposition time were -1.4 V and 240 s and frequency 25 Hz, amplitude 25 mV and step potential 4 mV. The linearity of zinc, cadmium and lead were20 130 µg.L -1 , 10 60 µg.L -1 and 6 54 µg.L -1 , limit of detection were 3.20 µg.L -1 for zinc and 1.60 µg.L -1 for cadmium and lead, respectively. Moreover, the propose electrode was applied to determine the metals in sea water. It gave the satisfactorily results.