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Kinetics of Carbaryl Degradation by Anodic Fenton Treatment in a Humic-Acid-Amended Artificial Soil Slurry

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A Fenton-based indirect electrochemical method, anodic Fenton treatment (AFT), developed for destroying and detoxifying pesticides in the aqueous environment, was evaluated for the degradation of a widely used pesticide, carbaryl, in an artificial soil slurry. More than 90% of carbaryl was removed in less than 20 minutes under given experimental conditions. The effect of initial slurry pH, humic acid content, initial carbaryl concentration, Fenton reagent delivery ratio, and soil/water ratio (w/v) were investigated. The results indicate that humic acid content is the key factor that slows down pesticide degradation, most probably because of its pH buffering and adsorption capacity. A kinetic model, which was shown to fit the experimental data quite well ( R 2 > 0.99), was developed to describe the carbaryl degradation in the soil slurry during the AFT process. In the presence of humic acid, carbaryl degradation kinetics was found to shift to a pseudo-first-order reaction after an “initiation” stage.
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Keywords: Fenton reaction; anodic Fenton treatment; carbaryl; degradation kinetic model; pesticide; soil

Document Type: Research Article

Publication date: 2009-01-01

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    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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