Study of the Photodegradation Kinetics of Fluometuron by UV Absorption Spectrophotometry and Fluorescence

Diégane Sarr *

Equipe des Materiaux, Electrochimie et Photochimie Analytique, Université Alioune Diop, Bambey, Sénégal, Laboratoire de Photochimie et d'Analyse, Université Cheikh Anta Diop, Dakar, Sénégal and Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV), ULCO, Dunkerque, France.

Diène Diegane Thiaré

Laboratoire de Photochimie et d'Analyse, Université Cheikh Anta Diop, Dakar, Sénégal and Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV), ULCO, Dunkerque, France.

Pape Abdoulaye Diaw

Equipe des Materiaux, Electrochimie et Photochimie Analytique, Université Alioune Diop, Bambey, Sénégal and Laboratoire de Photochimie et d'Analyse, Université Cheikh Anta Diop, Dakar, Sénégal.

Khémesse Kital

Laboratoire de Photochimie et d'Analyse, Université Cheikh Anta Diop, Dakar, Sénégal and Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV), ULCO, Dunkerque, France.

Adama Saba

Laboratoire de Chimie Organique et Phytopharmacie, Université J. Ki Zerbo Ouaga, Burkina Faso.

Cheikh Sall

Unité Mixte de Recherche d’Exploration et de Diagnostic, UFR Santé, Université Iba Der Thiam de Thiès, Senegal.

Atanasse Coly

Laboratoire de Photochimie et d'Analyse, Université Cheikh Anta Diop, Dakar, Sénégal.

François Delattre

Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV), ULCO, Dunkerque, France.

Alphonse Tine

Laboratoire de Photochimie et d'Analyse, Université Cheikh Anta Diop, Dakar, Sénégal.

*Author to whom correspondence should be addressed.


Abstract

In order to predict the fate of fluometuron in the aquatic environment and to assess the risk that it may pose, we studied its photolysis reaction in aqueous media. This reaction was monitored by UV absorption and fluorescence spectroscopy. UV irradiation source consisting of a 254 nm mercury lamp was used.  The study showed that fluometuron is unstable under the effect of light radiation when irradiated in water. The absorption band and the emission of this product were at 244 nm and 325 nm respectively. This study also shows that the photodegradation of fluometuron in water follows first order kinetics regardless of the method followed.  However, a difference was noted in the half-life times (t1/2). Indeed, these times found in UV and fluorescence are respectively 18.2 min and 6.6 min. The relatively lower value obtained in fluorescence could be explained by the fact that the latter is more sensitive to UV and fluorescence. In all cases, the half-lives found were relatively short (t1/2<1h). For more information on the photolysis of this herbicide, these two methods were combined with NMR and GC-MS to identify the different photoproducts that may be formed.

Keywords: Fluometuron, photodegradation, UV, fluorescence, photoproducts


How to Cite

Sarr, D., Thiaré, D. D., Diaw, P. A., Kital, K., Saba, A., Sall, C., Coly, A., Delattre, F., & Tine, A. (2022). Study of the Photodegradation Kinetics of Fluometuron by UV Absorption Spectrophotometry and Fluorescence. Asian Journal of Chemical Sciences, 12(3), 49–59. https://doi.org/10.9734/ajocs/2022/v12i3223

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