CARBON NANOTUBES/IONOPHORE MODIFIED ELECTRODE FOR ANODIC STRIPPING DETERMINATION OF LEAD

摘要

Bifunctional combination of carbon nanotubes and ionophore is introduced for anodic stripping analysis of lead (Pb(2+)). Carbon nanotubes are employed to improve the detection sensitivity due to their excellent electrical conductivity and strong adsorption ability. An ionophore is utilized for its excellent selectivity toward Pb(2+). The proposed carbon nanotubeslionophore modified electrode shows improved sensitivity and selectivity for Pb(2+). Low detection limit (1 nM), wide linear range (5 nM-8 mu M) and excellent selectivity over other metal ions (Cd(2+), Cu(2+), and Hg(2+)) was obtained. The practical application has been carried out for determination of Pb(2+) in real water samples.