Figure 2.

SWASV obtained from unmodified and alanine, threonine, glutamic acid, and lysine amino acid-modified GC electrodes for the detection of 10 μM Zn²⁺, 7.5 μM Cd²⁺, 5 μM Cu²⁺, and 7.5 μM Hg²⁺ in BRB of pH = 4 as striping solvent, keeping a scan rate of 100 mV/s, a deposition potential of −1.3 V, and a deposition time of 140 s.