Modified Fenton oxidation of diesel fuel in arctic soils rich in organic matter and iron.

Modified Fenton oxidation of diesel fuel in arctic soils rich in organic matter and iron.

Chemosphere (2014-07-30)

Mary K Sherwood, Daniel P Cassidy

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.

MATERIALS

Product Number

Brand

Product Description

PHR1068

Supelco

Ethylenediaminetetraacetic acid disodium salt dihydrate, Pharmaceutical Secondary Standard; Certified Reference Material

720712

Sigma-Aldrich

Iron(III) oxide, dispersion, nanoparticles, ≤110 nm particle size, 15 wt. % in ethanol

209309

Sigma-Aldrich

Iron, powder, −325 mesh, 97%

E5134

Sigma-Aldrich

Ethylenediaminetetraacetic acid disodium salt dihydrate, suitable for electrophoresis, Molecular Biology, 99.0-101.0% (titration)

ED2SS

Sigma-Aldrich

Ethylenediaminetetraacetic acid disodium salt dihydrate, reagent grade, 98.5-101.5% (titration)

E6635

Sigma-Aldrich

Ethylenediaminetetraacetic acid disodium salt dihydrate, Sigma Grade, suitable for plant cell culture, 98.5-101.5%

ED2SC

Sigma-Aldrich

Ethylenediaminetetraacetic acid calcium disodium salt hydrate

E1644

Sigma-Aldrich

Ethylenediaminetetraacetic acid disodium salt dihydrate, BioUltra, 98.5-101.5%

E4884

Sigma-Aldrich

Ethylenediaminetetraacetic acid disodium salt dihydrate, ACS reagent, 99.0-101.0%

88597

Millipore

Hydrogen peroxide solution, 3%, suitable for microbiology

44890

Sigma-Aldrich

Iron, puriss. p.a., carbonyl-Iron powder, low in magnesium and manganese compounds, ≥99.5% (RT)

03685

Sigma-Aldrich

Ethylenediaminetetraacetic acid disodium salt dihydrate, ≥97.0% (KT)

27285

Sigma-Aldrich

Ethylenediaminetetraacetic acid disodium salt dihydrate, meets analytical specification of Ph. Eur., BP, USP, FCC, 99.0-101.0%

356808

Sigma-Aldrich

Iron, foil, thickness 0.1 mm, ≥99.9% trace metals basis

IRMM524B

Iron, IRMM^®, certified reference material, 0.5 mm wire

18304

Sigma-Aldrich

Hydrogen peroxide solution, 34.5-36.5%

267945

Sigma-Aldrich

Iron, chips, 99.98% trace metals basis

03677

Sigma-Aldrich

Ethylenediaminetetraacetic acid disodium salt dihydrate, BioUltra, ≥99.0% (T)

1233009

USP

Edetate disodium, United States Pharmacopeia (USP) Reference Standard

GF87592630

Iron, foil, 100x100mm, thickness 0.125mm, hard, 99.5%

GF99892311

Iron, foil, 50x50mm, thickness 0.5mm, hard, 99.5%

GF70727801

Iron, tube, 200mm, outside diameter 3.18mm, inside diameter 1.96mm, wall thickness 0.61mm, as drawn, 99.5%

GF85519299

Iron, foil, 300x300mm, thickness 1.0mm, as rolled, 99.5%

GF67418062

Iron, tube, 500mm, outside diameter 12.0mm, inside diameter 9mm, wall thickness 1.5mm, annealed, 99.5%

GF69332519

Iron, foil, 50x50mm, thickness 0.25mm, as rolled, 99.99+%

GF93209328

Iron, tube, 200mm, outside diameter 8.0mm, inside diameter 5mm, wall thickness 1.5mm, annealed, 99.5%

GF84532844

Iron, foil, 50x50mm, thickness 0.125mm, as rolled, 99.99+%

GF68134574

Iron, wire reel, 1000m, diameter 0.25mm, hard, 99.5%

GF97162331

Iron, foil, 10mm disks, thickness 0.008mm, 99.85%

GF92236428

Iron, tube, 500mm, outside diameter 12.7mm, inside diameter 9.5mm, wall thickness 1.6mm, annealed, 99.5%