Journal of Chemistry / 2019 / Article / Fig 5

Research Article

Sensitive and Simultaneous Determination of Hydroquinone and Catechol in Water Using an Anodized Glassy Carbon Electrode with Polymerized 2-(Phenylazo) Chromotropic Acid

Figure 5

(a) CVs for the mixture solution of HQ and CT (0.5 mM each) in PBS (pH 7.0) at PCH/AGCE with different scan rates (a ⟶ l: 10, 20, 30, 40, 50, 75, 100, 150, 200, 300, 400, and 500 mV/s). The inset shows a plot of Ipa vs. the square root of the scan rate for HQ and CT. CVs of (b) CT (0.5 mM) and (c) HQ (0.5 mM) at the PCH/AGCE with different pH values (a ⟶ f: 4, 5, 6, 7, 8, and 9) at a scan rate of 100 mV/s. The inset shows plots of Epa vs. pH.

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