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pH dependence of the voltammetric response of the sensor in a TRIS buffer solution of different pHs in presence of 4.8 × 10−4 mol L−1 potassium ions. Scan rate = 50 mV s−1. The anodic peak current (ΔIpa/μA) was obtained by the difference of the currents in the presence and absence of potassium ions.
