A Highly Sensitive Electrochemical Sensor Based on Electrocatalytic Reduction Effect of Cu²⁺ on Trace Determination of Malathion in Soil and Other Complex Matrices

Figure 6

Standard addition SW-CSVs for the determination of malathion and Cu²⁺ ions at pH 2 under the optimized parameters in soil (a) and cabbage (b) at HMDE. Deposition and staring potential −0.2 V, accumulation time 360 s scan rate = 100 mV/s, pulse amplitude = 50 mV, and frequency 60 Hz.

(a)

(b)