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(A) Influence of different pH condition (pH-3 to pH-9) on sensing (20 µM) of 3-NP and 4-NP; (B) the relationship between pH vs. cathodic peak current of both 3-NP and 4-NP; (C) the relationship between pH vs. cathodic potential shift of both 3-NP and 4-NP; (D) the influence of different scan rates (30 to 400 mV/s) in the presence of 20 µM of 3-NP and 4-NP in 0.1 M PBS; and (E) the relationship between the square root of scan rate vs. cathodic peak current of 3-NP and 4-NP.
