Voltammetry stripping peak potential

The surfaces consisted of a random mixture of Pt and Ru sites in a square lattice, at different mixing ratios. Our initial simulations were designed to mimic as closely as possible the experiments carried out by Gasteiger et al. [38]. Therefore, we simulated the stripping voltammetry of a 0.99 monolayer of CO on the surface as a function of both the Ru content of the surface and the CO diffusion coefficient. A plot of the CO stripping peak potential as a function of the Ru content for three different diffusion coefficient is shown in Figure 16.8. In fact, the plot for large D reproduces a similar plot by... 

Voltaic cells 64. 504 Voltammetry 7, 591 anodic stripping, 621 concentration step, 621 mercury drop electrode, 623 mercury film electrode, 623 peak breadth, 622 peak current, 622 peak potential, 622 purity of reagents, 624 voltammogram, 622 D. of lead in tap water, 625 Volume distribution coefficient 196 Volume of 1 g of water at various temperatures, (T) 87... 

The most common species determined by cathodic stripping voltammetry are anions such as halides or sulphide, at a mercury electrode. This involves formation of a film of mercury(I) salts on the electrode in the deposition step. The anodic oxidation process involved in the deposition step is in fact the oxidation of mercury metal to mercury(I) ions. These immediately precipitate insoluble mercury(I) salts with the halide ion etc, on to the surface of the electrode. The anodic deposition potential required depends on the anion concerned. The subsequent cathodic stripping peak for the mercury(I) salt of each anion has at its own individual potential. 

For example, zinc sulfide, copper sulfide, cadmium sulfide, and lead sulfide Qdots were attached to four different secondary antibodies to detect four different proteins [56]. The four different Qdots were dissolved to yield four different metal ions, each associated with a different protein. These were measured by stripping voltammetry after dissolution of the particles following the binding steps. Multiple metal striped rods, spheres or alloy rods were also used for multiplexing. The rods were capped with a gold end for attachment to Ab2. Upon dissolution, these materials give a series of metal stripping peaks whose peak potentials and relative intensities are associated with individual analyte proteins [38]. Such bar code labels have the potential to determine many proteins in patient samples, but this has yet to be reported. 

The voltammetry in Figure 17.10 shows the characteristic features expected for electrodeposition with a mass transport-limited reduction of Cu(I) to Cu(0) at negative potentials, accompanied by a stripping peak for Cu on the return scan. The stripping peak is sharp and undistorted, showing that iR drop is insignificant in these experiments. The inset in Figure 17.10 shows a plot of the mass transport-limited currents at a microdisk electrode for... 

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