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Multivariate analysis of photo-Fenton degradation of the herbicides tebuthiuron, diuron and 2,4-D.
Chemosphere. 2005 Feb; 58(8):1107-16.C

Abstract

The degradation of herbicides in aqueous solution by photo-Fenton process using ferrioxalate complex (FeOx) as source of Fe2+ was evaluated under blacklight irradiation. The commercial products of the herbicides tebuthiuron, diuron and 2,4-D were used. The multivariate analysis, more precisely, the response surface methodology was applied to evaluate the role of FeOx and hydrogen peroxide concentrations as variables in the degradation process, and in particular, to define the concentration ranges that result in the most efficient degradation of the herbicides. The degradation process was evaluated by the determination of the remaining total organic carbon content (TOC), by monitoring the decrease of the concentrations of the original compounds using HPLC and by the chloride ion release in the case of diuron and 2,4-D. Under optimized conditions, 20 min were sufficient to mineralize 93% of TOC from 2,4-D and 90% of diuron, including oxalate. Complete dechlorination of these compounds was achieved after 10 min reaction. It was found that the most recalcitrant herbicide is tebuthiuron, while diuron shows the highest degradability. However, under optimized conditions the initial concentration of tebuthiuron was reduced to less than 15%, while diuron and 2,4-D were reduced to around 2% after only 1 min reaction. Furthermore, it was observed that the ferrioxalate complex plays a more important role than H2O2 in the photodegradation of these herbicides in the ranges of concentrations investigated.

Authors+Show Affiliations

UNESP-São Paulo State University, Institute of Chemistry of Araraquara, CP 355, 14801-970 Araraquara, SP, Brazil.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15664618

Citation

Paterlini, Willian C., and Raquel F Pupo Nogueira. "Multivariate Analysis of photo-Fenton Degradation of the Herbicides Tebuthiuron, Diuron and 2,4-D." Chemosphere, vol. 58, no. 8, 2005, pp. 1107-16.
Paterlini WC, Nogueira RF. Multivariate analysis of photo-Fenton degradation of the herbicides tebuthiuron, diuron and 2,4-D. Chemosphere. 2005;58(8):1107-16.
Paterlini, W. C., & Nogueira, R. F. (2005). Multivariate analysis of photo-Fenton degradation of the herbicides tebuthiuron, diuron and 2,4-D. Chemosphere, 58(8), 1107-16.
Paterlini WC, Nogueira RF. Multivariate Analysis of photo-Fenton Degradation of the Herbicides Tebuthiuron, Diuron and 2,4-D. Chemosphere. 2005;58(8):1107-16. PubMed PMID: 15664618.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Multivariate analysis of photo-Fenton degradation of the herbicides tebuthiuron, diuron and 2,4-D. AU - Paterlini,Willian C, AU - Nogueira,Raquel F Pupo, PY - 2004/02/03/received PY - 2004/09/03/revised PY - 2004/09/15/accepted PY - 2005/1/25/pubmed PY - 2005/4/6/medline PY - 2005/1/25/entrez SP - 1107 EP - 16 JF - Chemosphere JO - Chemosphere VL - 58 IS - 8 N2 - The degradation of herbicides in aqueous solution by photo-Fenton process using ferrioxalate complex (FeOx) as source of Fe2+ was evaluated under blacklight irradiation. The commercial products of the herbicides tebuthiuron, diuron and 2,4-D were used. The multivariate analysis, more precisely, the response surface methodology was applied to evaluate the role of FeOx and hydrogen peroxide concentrations as variables in the degradation process, and in particular, to define the concentration ranges that result in the most efficient degradation of the herbicides. The degradation process was evaluated by the determination of the remaining total organic carbon content (TOC), by monitoring the decrease of the concentrations of the original compounds using HPLC and by the chloride ion release in the case of diuron and 2,4-D. Under optimized conditions, 20 min were sufficient to mineralize 93% of TOC from 2,4-D and 90% of diuron, including oxalate. Complete dechlorination of these compounds was achieved after 10 min reaction. It was found that the most recalcitrant herbicide is tebuthiuron, while diuron shows the highest degradability. However, under optimized conditions the initial concentration of tebuthiuron was reduced to less than 15%, while diuron and 2,4-D were reduced to around 2% after only 1 min reaction. Furthermore, it was observed that the ferrioxalate complex plays a more important role than H2O2 in the photodegradation of these herbicides in the ranges of concentrations investigated. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/15664618/Multivariate_analysis_of_photo_Fenton_degradation_of_the_herbicides_tebuthiuron_diuron_and_24_D_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(04)00865-3 DB - PRIME DP - Unbound Medicine ER -