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(A): DPV for different concentrations of nitrite on Fc-ECG/SPE (a-k: 1.0, 5.0, 10, 15, 20, 25, 30, 35, 40, 45, 50 μmol·L−1), insert: calibration plot for various concentrations of nitrite; (B): The selectivity of Fc-ECG/SPE sensor for nitrite, NO3−, CO32−, SO42−, PO43−, Cl−, H2PO4−, and HPO42−, the concentration of each compound is 100 μmol·L−1; (C): The repeatability of Fc-ECG/SPE sensor; (D): The stability of Fc-ECG/SPE sensor.
