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

Segura, Rodrigo.*, Pizarro, Jaime., Oyarzun, María., Castillo, Alejandra., Díaz, Karina., Placencio, Alan.

Keywords: Adsorptive stripping voltammetry, bismuth film electrode, Nafion, cadmium and lead

Abstract

The application and validation of a glassy carbon electrode modified with Nafion, 1-nitroso-2-naphthol and bismuth film (GC/NF-NN/BiFE) was studied using adsorptive stripping voltammetry (AdSV) for the determination of Pb2+ and Cd2+ in tap water. The parameters studied and optimized were pH, 1-nitroso-2-naphthol concentration (CNN), Nafion concentration (CNF), adsorption potential (Eacc) and adsorption time (tacc). Optimal conditions were pH 4.5 (acetate buffer solution 0.10 mol L-1); Eacc: -1.30 V; tacc: 120 s; CNN : 0.10% w/v, CNF: 0.50 wt %. The detection and cuantification limits were 0.08 and 0.29 μg L-1 for Pb2+ and 0.07 and 0.24 μg L-1 for Cd2+, with a linear range of 10 to 70 μg L-1. Certified reference material (ICP Multi Element Standard) and synthetic samples were determined to validate the methodology, with satisfactory results. The stripping voltammetry method was tested on tap water.

Más información

Título de la Revista: INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Volumen: 11
Editorial: ESG
Fecha de publicación: 2016
Página de inicio: 1707
Página final: 1719
Idioma: Inglés
URL: http://electrochemsci.org/papers/vol11/110201707.pdf