Resumo

BERNARDELLI, Jossy Karla Brasil; LAPOLLI, Flávio Rubens; CRUZ, Carlos Marcus Gomes da Silva  e  FLORIANO, João Batista. Determination of zinc and cadmium with characterized Electrodes of carbon and polyurethane modified by a bismuth film. Mat. Res. [online]. 2011, vol.14, n.3, pp. 366-371.  Epub 26-Ago-2011. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392011005000058.

This study aims to use electrodes modified with bismuth films for the determination of zinc and cadmium. The film was electrodeposited ex situ on a composite carbon electrode with polyurethane and 2% metallic bismuth (2BiE) and on a carbon bar electrode (CBE). The electrodes were characterized by scanning electron microscopy and energy dispersive spectroscopy. Through differential pulse anodic stripping voltammetry, the electrodes 2BiE and CBE containing bismuth films showed a limit of detection (LOD) of 5.56 × 10^-5 and 3.07 × 10^-5 g.L^-1 for cadmium and 1.24 × 10^-4 and 1.53 × 10^-4 g.L^-1 for zinc, respectively. The presence of a bismuth film increased the sensitivity of both electrodes.

Palavras-chave : voltammetry; modified electrode; metals; bismuth film.