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. Author manuscript; available in PMC: 2023 Jun 29.
Published in final edited form as: Anal Chem. 2022 Sep 6;94(37):12638–12644. doi: 10.1021/acs.analchem.2c01630

Figure 2.

Figure 2.

Voltammetry of interferents (A, B) and cocaine mixed with interferents (C, D) overlaid with a reference positive identification of 10 mM cocaine in 0.5 M KCl (solid black line). (A) Representative anodic stripping voltammograms of each weak acid/base cutting agent (10 mM in 0.5 M KCl). (B) Representative anodic stripping voltammograms of each adulterant (10 mM in 0.5 M KCl). (C) Representative anodic stripping voltammograms of 10 mM: 10 mM mixtures of each cutting agent: cocaine in 0.5 M KCl overlaid with a voltammogram of 10 mM cocaine in 0.5 M KCl (solid black line). (D) Representative anodic stripping voltammograms of 10 mM: 10 mM mixtures of adulterant: cocaine in 0.5 M KCl overlaid with a voltammogram of 10 mM cocaine in 0.5 M KCl (solid black line). All voltammetry was collected at a scan rate of 0.5 V/s with a glassy carbon (d = 3 mm) working electrode, a Ag/AgCl reference electrode, and a platinum wire counter electrode. In line with the IUPAC convention, the anodic current is represented as positive in all voltammograms.