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(A) Cyclic voltammograms of 0.14 mmol/L estriol in 0.1 mol/L BRBS at pH 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0 and 12.0 obtained with the Co-poly(Met)/GCE at v = 50 mV/s. (B) Effect of pH on estriol peak current (blue line) and estriol peak potential (black line). Inserted graph: proposed oxidation reactions for estriol on Co-poly(Met)/GCE.
