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Soil organic matter-hydrogen peroxide dynamics in the treatment of contaminated soils and groundwater using catalyzed H2O2 propagations (modified Fenton's reagent)

Permanent URL:
http://handle.nal.usda.gov/10113/11553
Abstract:
The interactions between catalyzed H2O2 propagations (CHP-i.e. modified Fenton's reagent) and soil organic matter (SOM) during the treatment of contaminated soils and groundwater was studied in a well-characterized surface soil. The fate of two fractions of SOM, particulate organic matter (POM) and nonparticulate organic matter (NPOM), during CHP reactions was evaluated using concentrations of hydrogen peroxide from 0.5 to 3 M catalyzed by soluble iron (III), an iron (III)-ethylenediamine tetraacetic acid (EDTA) chelate, or naturally-occurring soil minerals. The destruction of total SOM in CHP systems was directly proportional to the hydrogen peroxide dosage, and was significantly greater at pH 3 than at neutral pH; furthermore, SOM destruction occurred predominantly in the NPOM fraction. At pH 3, SOM did not affect hydrogen peroxide decomposition rates or hydroxyl radical activity in CHP reactions. However, at neutral pH, increasing the mass of SOM decreased the hydrogen peroxide decomposition rate and increased the rate of hydroxyl radical generation in CHP systems. These results show that, while CHP reactions destroy some of the organic carbon pools, SOM does not have a significant effect on the CHP treatment of soils and groundwater.
Author(s):
Bissey, L.L. , Smith, J.L. , Watts, R.J.
Subject(s):
soil organic matter , hydrogen peroxide , dynamics , polluted soils , groundwater contamination , catalysts , particulates , organic matter , iron , EDTA (chelating agent) , remediation , soil mineralogy , minerals , soil pH , radicals , degradation , soil organic carbon , provenance , silt loam soils , West Virginia
Format:
p. 2477-2484.
Note:
Includes references
Source:
Water research 2006 July, v. 40, issue 13
Language:
English
Year:
2006
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.