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Validation of the applied methodology by monitoring the SWASV peak current responses of 10 μM Zn2+, 7.5 μM Cd2+, 5 μM Cu2+, and 7.5 μM Hg2+ ion solutions under chosen optimized conditions; (A) showing repeatability of the designed Ala/GCE electrode at multiple scans (n = 4) and (B) SWASV showing reproducibility of multiple fabricated Ala/GCE electrodes (n = 4)
