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

Figure 2

(a) CVs of the electropolymerization of CH onto the AGCE in 0.1 M PBS (pH 7.0). Inset shows CVs for bare GCE. Scan rate: 100 mV/s. (b) CV of the PCH/AGCE in PBS with different pH values (a–f: 4.0, 5.0, 6.0, 7.0, 8.0, and 9.0). Scan rate: 100 mV/s. (c) CVs of the PCH/AGCE in 0.1 M PBS (pH 7.0) at various scan rates (a–k:10, 20, 30, 40, 50, 75, 100, 150, 200, 300, and 400 mV/s). Inset shows plots of I_pa and I_pc (μA) versus the scan rate (mV/s) U+002e.

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