Electroanalytical Methodology for the Direct Determination of 2,4-Dichlorophenoxyacetic Acid in Soil Samples Using a Graphite-Polyurethane Electrode

Figure 2

SWV curves for 2,4-D (10.5 mg L⁻¹) in 0.1 mol L⁻¹ BR buffer solution (pH 2.0) obtained using different working electrodes: (a) blank in glassy carbon, (b) 2,4-D in glassy carbon, (c) blank in carbon paste, (d) 2,4-D in carbon paste, (e) blank in GPU, and (f) 2,4-D in GPU. Parameters: 𝑓 = 50 s⁻¹, 𝑎 = 0.50 V, Δ𝐸_𝑖= 0.03 V, 𝑡_acc = 10 s, and 𝐸_acc = 0.0 V.