Fig. 5. (A) Cyclic voltammograms of 5.0 × 10⁻⁶ mol L⁻¹ luteolin on Pt–BPC/CILE in 0.1 mol L⁻¹ PBS (pH 3.0) at different scan rates (from a to k: 30, 50, 80, 100, 200, 300, 400, 500, 600, 700, 800 mV s⁻¹). (B) The linear relationship of I_p with υ. (C) The linear relationship of E_p with ln υ.