The possibilities of remediation of a Latossolo Vermelho Amarelo artificially contaminated with oil (5,000 mg kg-1) were investigated. Different remediation methods with chemical oxidants were compared: KMnO4 0.10 mol L-1; K2S2O8 0.10 mol L-1; H2O2 0.10 mol L-1; H2O2/Fe2+ 0.10/0.08 mol L-1 (Fenton's reaction) and H2O2/Fe2+/UV 0.10/0.08 mol L¹ (photo-Fenton reaction). The remediation was practically complete (99 %) after 30 min of the photo-Fenton process. No other oxidant reached this dissipation rate after 180 min. The remediation was least efficient with 0.10 mol L-1 H2O2 (70.51 %). The addition of iron ions increased the dissipation rate to 86.98 % (H2O2/Fe2+ 0.10/0.08 mol L-1). The conventional methods reached rates of 76.58 % (KMnO4 0.10 mol L-1) and 93.85 % (K2S2O8 0.10 mol L-1).
Fenton reaction; peroxide; permanganate; persulfate
