Figure 3.

(a) I–V responses of various compounds (2-NBBSH, 3-NBBSH, and 4-NBBSH) coated on a GCE (at pH = 7.0); (b) selectivity study at 100.0 nM in the presence of various cations including mercury; (c) control experiment with various synthesized compounds under identical conditions, [analyte concentration = 100.0 nM, pH = 7.0, amount: 25.0 μL, surface area of GCE = 0.0316 cm², method: I–V, delay time = 1.0 s]; and (d) bar diagram presentation of selectivity optimization at +1.2 V.