A Novel Tellurium Film Electrode for Simultaneous Determination of Cd(II) and Pb(II) Using Anodic Stripping Voltammetry

摘要

Tellurium film modified glassy carbon electrode (TeFE) is presented in this paper as a promisingalternative candidate for simultaneous electrochemical determination of Cd(II) and Pb(II) using anodicstripping voltammetry (ASV) analysis. Key operational parameters, including deposition potential anddeposition time were investigated. Under the optimum conditions, TeFE exhibited well-defined andseparated stripping peaks for Cd(II) and Pb(II) and a linear relationship existed between the currentsand the concentrations of Cd(II) and Pb(II) in the range from 20 g/L to 370 g/L, with the detectionlimits of 0.50 g/L for Cd(II) and 0.80 g/L for Pb(II) respectively. Compared with the traditionalmercury-film electrode and recently introduced bismuth film electrode, the TeFE displays widerpotential window, low toxicity and better stability. The interference experiments showed that somemetal ions have little influence on the ASV signals of Cd(II) and Pb(II). The proposed tellurium film- based modified electrode, a new promising type of less toxic electrode, opens new opportunities forhighly sensitive determination of metal ions.