Fig. 3. Degradation of alachlor in 2.50 g L^–1 humic acid slurry by anodic Fenton treatment (AFT) at different delivery rates of Fenton reagent. The H₂O₂ to Fe²⁺ ratio is kept at 10:1. Points are experimental data and lines are fitting results using the first-order model. The last two points are not included in model fitting for data from treatment at 0.090 or 0.120 A.