Fig. 4From: Voltammetric approach for pharmaceutical samples analysis; simultaneous quantitative determination of resorcinol and hydroquinoneA Nyquist diagrams of (a) ZnFe2O4/NPs/IL/CPE, (b) IL/CPE, (c) ZnFe2O4 /NPs /CPE and (d) CPE. Conditions: 500 µM RC in PBS (0.1 M) pH 6, over the frequency range of 0.1 to 100,000 Hz. B Corresponding equivalent circuitsBack to article page