title: Modified Fenton oxidation of diesel fuel in arctic soils rich in organic matter and iron.
abstract: Modified Fenton (MF) chemistry was tested in the laboratory to treat three diesel fuel-contaminated soils from the Canadian arctic rich in soil organic matter (SOM) and Fe oxides. Reactors were dosed with hydrogen peroxide (HP), and treatment was compared in reactors with SOM as the only chelate vs. reactors to which ethylenediaminetetraacetate (EDTA) was added. Concentrations of diesel fuel and HP were measured over time, and the oxidation of both diesel fuel and SOM were quantified in each soil. A distinct selectivity for oxidation of diesel fuel over SOM was observed. Reactors with EDTA showed significantly less diesel fuel oxidation and lower oxidant efficiency (diesel fuel oxidized/HP consumed) than reactors with SOM as the only chelate. The results from these studies demonstrate that MF chemistry can be an effective remedial tool for contaminated arctic soils, and challenge the traditional conceptual model that SOM reduces the efficiency of MF treatment through excessive scavenging of oxidant.
authors: Kent County Department of Public Works, 1500 Scribner NW, Grand Rapids, MI 49504, United States.
authors: Mary K
authors: MK
authors: Sherwood
authors: Western Michigan University, Department of Geosciences, Kalamazoo, MI 49008-5241, United States. Electronic address: daniel.cassidy@wmich.edu.
authors: Daniel P
authors: DP
authors: Cassidy
mesh_terms: D001110:Arctic Regions; D002170:Canada; D002614:Chelating Agents; D004492:Edetic Acid; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry; D005742:Gasoline / Q000032:analysis*; D006812:Humic Substances / Q000032:analysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D008956:Models, Chemical; D010084:Oxidation-Reduction; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D002614:Chelating Agents; C045076:Fenton's reagent; D005290:Ferric Compounds; D005742:Gasoline; D006812:Humic Substances; D012989:Soil Pollutants; C000499:ferric oxide; D004492:Edetic Acid; D006861:Hydrogen Peroxide; D007501:Iron
keywords: Arctic soils; Chelated-Iron; EDTA; Humic acid; Modified Fenton; Soil organic matter (SOM)