Determination of Lead and Cadmium in Water Samples by Adsorptive Stripping Voltammetry Using a Bismuth film/1- Nitroso-2-Napthol/Nafion Modified Glassy Carbon Electrode

摘要

The application and validation of a glassy carbon electrode modified with Nafion, 1-nitroso-2-naphtholand bismuth film (GC/NF-NN/BiFE) was studied using adsorptive stripping voltammetry (AdSV) for2+ 2+ the determination of Pb and Cd in tap water. The parameters studied and optimized were pH, 1- nitroso-2-naphthol concentration (CNN), Nafion concentration (CNF), adsorption potential (Eacc) and-1 adsorption time (tacc). Optimal conditions were pH 4.5 (acetate buffer solution 0.10 mol L ); Eacc:-1.30 V; tacc: 120 s; CNN : 0.10% w/v, CNF: 0.50 wt %. The detection and quantification limits were-1 2+ -1 2+ -1 0.08 and 0.29 g L for Pb and 0.07 and 0.24 g L for Cd , with a linear range of 10 to 70 g L .Certified reference material (ICP Multi Element Standard) and synthetic samples were determined tovalidate the methodology, with satisfactory results. The stripping voltammetry method was tested ontap water.