Journal of Analytical Methods in Chemistry / 2019 / Article / Fig 4

Research Article

Electrodeposition of 4-Benzenesulfonic Acid onto a Graphite-Epoxy Composite Electrode for the Enhanced Voltammetric Determination of Caffeine in Beverages

Figure 4

Complex plane spectra recorded for experiments carried out in solution pH 2.0 where (a) is OCP in absence of caffeine, (b) OCP in absence of caffeine for each electrodes recorded at , (c) OCP in presence of 2.0 mmol·L−1 of caffeine for each electrodes, and (d) complex plane spectra recorded for in presence of 2.0 mmol·L−1 of caffeine for each electrode.
(a)
(b)
(c)
(d)

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