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Differential pulse voltammetry (DPV) measurements of the glassy carbon electrode (GCE) with different modifications: (a) GCE, (b) N–Cu–MOF/GCE, (c) AP1/N–Cu–MOF/GCE in 1 mmol L−1 PBS (pH 5.0) and (d) AP1/N–Cu–MOF/GCE is in PBS (1 mmol L−1, pH 5.0) containing 10 ng mL−1 DON.
