Simultaneous Voltammetric Determination of Ascorbic Acid, Paracetamol, and Caffeine Using Electrochemically Reduced Graphene-Oxide-Modified Electrode

Figure 8

(a) DP-ASV curves obtained for the oxidation of AA, PA, and CA at equal concentrations in the 0.2 M B–R buffer solution of pH 3.2: (1) 0.2, (2) 0.4, (3) 0.6, (4) 0.8, (5) 1.0, (6) 1.4, (7) 1.8, (8) 2.2, (9) 2.5, (10) 2.9, (11) 3.7, and (12) 4.4 μM. (b) Linear plots of , , and with their concentrations (scan rate = 0.02 V·s⁻¹; ; ; ).

(a)

(b)