Fig. 5. (A) Effect of the electrolyte pH on the peak current of 2.0 μM Cu²⁺, Cd²⁺ and Hg²⁺ in 0.1 M PBS (deposition potential: −0.9 V, deposition time: 400 s). (B) Effect of the deposition potential on the peak current of 2.0 μM Cu²⁺, Cd²⁺ and Hg²⁺ in 0.1 M PBS (pH 6.5) (deposition time: 400 s). (C) Effect of the deposition time on the peak current of 2.0 μM Cu²⁺, Cd²⁺ and Hg²⁺ in 0.1 M PBS (pH 6.5) (deposition potential: −0.9 V).