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Comparison of differential pulse voltammograms obtained in the course of Cd(II) determination at the CuF/CN/SPE working electrode: (a) background, without addition of Cu(II) and Cd(II); (b) as (a) + 1 × 10−7 M Cd(II); (c) as (a) + 2 × 10−4 M Cu(II); and (d) as (b) + 2 × 10−4 M Cu(II). Accumulation potential and time was −0.7 V and 210 s, respectively.
