Determination of Lead Ion by a Modified Carbon Paste Electrode Based on Multi-Walled Carbon Nanotubes (MWCNTs) and Poly 4-N-Pyridine Para Styrene Sulfonamide

In the present study, a novel electrode based on multi-walled carbon nanotubes (MWCNTs) modified with poly 4-N-pyridine para styrene sulfonamide for the determination of trace amount of Pb+2 was prepared. In order to explore the selectivity, reliability and accuracy of this new type of electrode, a number of electrodes were prepared and tested under various conditions for the determination of trace amount of Pb+2 in an aquatic environment. In particular, the modified electrode was used to determine the concentration of Pb+2 in a wastewater of Isfahan’s Mobarkeh steel and ZobAhan companies. As a result, our modified electrode with an optimized conditions (concentrations of 6 wt% carrier, 12 wt% MWCNTs, 20 wt% paraphin oil and 62 wt% graphite powder) exhibited a high selectivity, a good Nernstian slope (-29.43 ± 0.3 mV/decade), a linear concentration range of (1.0×10-1to 1.0×10-8M), an excellent detection limit of (6.0×10-9M), a fast response time (20s), (5.0-8.5).a long life time (2 months) at a wide range of pH

کلیدواژه ها:

Carbon paste electrode ، Ligand ، MWCNTs ، Potentiometric