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We report the evaluation of glassy carbon (GC) electrodes modified with Nafion (Nf) films and bimetallic alloyed deposits of Ag-Hg and Ag-Bi. Most of the deposited bimetallic, with an average size of approximately 150 nm, were uniformly dispersed and embedded inside the cells of the Nafion net, while a much lesser amount of them remained on top of the embedded ones without any regular orientation, as indicated by scanning electron microscopy (SEM) and atomic force microscopy (AFM) images. Sensitivity tests for the AgBiNf/GC modified electrode produced detection limits (DL), based on the variability of a blank solution (3 s criterion), of 0.78 and 0.66 μg L-1 for Cd(II) and Pb(II), respectively while for the AgHgNf/GC modified electrode DLs were 0.17 and 0.24 μg L-1 for Cd(II) and Pb(II), respectively. Accuracy of the anodic re-dissolution voltammetry methodology was checked by calculation of percentages of recovery of the two analytes, expressed as relative error. Recovery from 99 % to 92 % was achieved.

Detection of Cd (II) and Pb (II) by anodic stripping voltammetry using glassy carbon electrodes modified with Ag-Hg and Ag-Bi bimetallic alloyed