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

Figure 3

Linear sweep voltammetry of malathion in the presence of malathion in the presence of Cu²⁺ ions at pH 2 at 800 (a) and 100 (b) mV s⁻¹ scan rate at pH 2 at the HMDE versus Ag/AgCl electrode. [Malathion] = 6.0 × 10⁻⁸ M and [Cu²⁺] = 3.4 × 10⁻⁷ M.