Fig. 4. (a) CVs of a GC electrode in an aqueous solution of NaCl (1 M) and HNO₃ (pH ∼ 1, 0.1 M) without (black) and with (red) 1-NP (c _Ag+ = 5.30 μM). Scan rate: 100 mV s^–1. (b) Controlled potential electrolysis curves of 1-NP at 20 °C (black) and 40 °C (red).