Polymeric Foams as the Matrix of Voltammetric Sensors for the Detection of Catechol, Hydroquinone, and Their Mixtures

Figure 4

Equivalent electrical circuit used to simulate the response of the samples where Rs is the solution resistance, CPE1 is a first constant phase element, R1 is a first resistance, CPE2 is a second constant phase element, and R2 is a second resistance.