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(A) DPV responses obtained for successive increasing concentrations of CPS (0.01–7.0 μM) using 0.12 M Britton–Robinson buffer (pH 2.0) as the supporting electrolyte; (B) Respective calibration plots. DPV conditions: amplitude = 80 mV, step potential = −6 mV, modulation time = 30 ms, and scan rate = 12 mV s–1.
