Evaluation of the intermediates generated during the degradation of Diuron and Linuron herbicides by the photo-Fenton reaction

Farré, María José, Brosillon, Stephan, Domènech, Xavier and Peral, José (2007) Evaluation of the intermediates generated during the degradation of Diuron and Linuron herbicides by the photo-Fenton reaction. Journal of Photochemistry and Photobiology A: Chemistry, 189 2-3: 364-373. doi:10.1016/j.jphotochem.2007.02.028


Author Farré, María José
Brosillon, Stephan
Domènech, Xavier
Peral, José
Title Evaluation of the intermediates generated during the degradation of Diuron and Linuron herbicides by the photo-Fenton reaction
Journal name Journal of Photochemistry and Photobiology A: Chemistry   Check publisher's open access policy
ISSN 1010-6030
Publication date 2007-06-25
Sub-type Article (original research)
DOI 10.1016/j.jphotochem.2007.02.028
Open Access Status
Volume 189
Issue 2-3
Start page 364
End page 373
Total pages 10
Place of publication Lausanne, Switzerland
Publisher Elsevier Sequoia
Language eng
Subject 03 Chemical Sciences
Abstract Freshwater polluted with herbicides is a problem of general concern since these compounds are commonly toxic and non-biodegradable. An innovative technology for the elimination of such compounds is the coupling between an Advanced Oxidation Process (AOP) and a biological treatment. The success of this coupled methodology depends on the biodegradable nature of the by-products originated at the end of the chemical stage. The present paper is based on the analysis of the intermediates generated during the chemical oxidation of Diuron and Linuron herbicides using three different doses of photo-Fenton reactants. Among the three effluents obtained after the chemical pre-treatment, only the most oxidised is completely biodegradable. Several analytical methods: reverse phase ultra pressure liquid chromatography UPLC(RP)/MS, ionic chromatography IC and gas chromatography/MS have been used to elucidate the degradation mechanism. Beyond conventional separation methods, hydrophilic interaction chromatography HILIC coupled with mass spectrometry has been necessary to identify small polar compounds at the end of oxidation process. The first steps of the degradation mechanism have been ascertained. Furthermore, different by-products have been found at the end of the chemical process when different reactant doses were used. These differences have been based on the presence of urea derivates (methylurea, 1,1-dimethylurea) and unidentified chlorinated compounds
Keyword Biodegradability
Herbicides
By-products
Biological treatment
Photo-Fenton
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Advanced Water Management Centre Publications
 
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