Figure 7.

(A) Voltammograms of metal analytes performed with an alanine-modified electrode in the presence of 2 mM of one of the interfering agents, i.e., K⁺, Na⁺, As³⁺, Ag⁺, Cs⁺, Ca²⁺, Sr²⁺, Co²⁺, Pb²⁺, Cl^–, EDTA, citric acid, glucose, SDS, CTAB, 2-amino-4- nitrophenol, and 3-chloro-5-nitrophenol in cell having 10 μM Zn²⁺, 7.5 μM Cd²⁺, 5 μM Cu²⁺, and 7.5 μM Hg²⁺ ions in BRB of pH 4 under chosen optimized conditions. (B) Corresponding bar graphs showing adsorptive stripping peak current I_p of SWASV affected by 2 mM concentrations of various ions and organic interfering agents.