Anodic Stripping Square-Wave Voltammetry of Metal Ions

2 Anodic Stripping Square-Wave Voltammetry of Metal Ions 

Relationship between the net stripping peak potential and the logarithm of the parameter A is shown in Fig. 2.25b. On very thick films (A 10) is independent of frequency, while on very thin films (A 0.3) it is a linear function of the logarithm of frequency, with the slope dE Jd log/ = 23RT/2nF, as in the case of direct measurements (see Fig. 2.23b). 

At a very thin film AW depends linearly on the parameter A, as can be seen in Fig. 2.27 [45], The slope of this straight line is A Fp /A = 0.23. So, the net stripping peak current is linearly proportional to the frequency. For the parameters in Fig. 2.27, this relationship is  

Considering (2.26), the net stripping peak current is independent of the film thickness  

The effects of mercury film electrode morphology in the anodic stripping SWV of electrochemically reversible and quasi-reversible processes were investigated experimentally [47-51], Mercury electroplated onto solid electrodes can take the form of either a uniform thin film or an assembly of microdroplets, which depends on the substrate [51 ]. At low sqtrare-wave frequencies the relationship between the net peak crrrrent and the frequency can be described by the theory developed for the thin-film electrode because the diffusion layers at the snrface of microdroplets are overlapped and the mass transfer can be approximated by the planar diffusion model [47,48], 

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