A Voltammetric Approach for the Simultaneous Determination of Cd and Pb in Water Applying Carbon Paste Electrode Modified with Bismuth Film

This study reports the simultaneous voltammetric determination of Cd and Pb by square wave voltammetry (SWV) using carbon paste electrode modified with bismuth film. For the ex situ film formation, the influence of Bi concentration, time and deposition potential was evaluated. Regarding the SWV parameters, frequency, amplitude, deposition time and deposition potential were evaluated. The ideal conditions of film formation were achieved with 1 mg/L Bi applying -0.6 V during 300 s (0.01 M acetate buffer, pH 4.6). The highest current values of Cd and Pb were obtained in 0.01 M acetate buffer (pH 4.6) with deposition potential of -1.1 V, time deposition of 180 s, frequency of 40 Hz, amplitude of 40 mV and potential step of 0.005 V. The detection limits calculated for Cd and Pb were 0.5 and 0.3 [micro]g/L, respectively, and the method was successfully applied to the analysis of commercial potable water.
Author(s): Cristiane de Oliveira [sup.1], Juliana Villela Maciel [sup.1], Anelise Christ-Ribeiro [sup.1], Ananda Guarda [sup.2], Daiane Dias [sup.1] Author Affiliations: (1) grid.411598.0, 0000 0000 8540 6536, Laboratório de Eletroespectro Analítica [...]