Photoinductive degradation of two pesticies by natural dissolved organic matter under simulated sunlight

Emilie Caupos (1) , Patrick Mazellier (2, 3) , Jean-Philippe Croue (1, 4)

1 LCME - Laboratoire de Chimie et Microbiologie de l'Eau
2 LCEE - Laboratoire de Chimie de l'Eau et de l'Environnement
3 LPTC - Laboratoire de Physico -& Toxico Chimie des systèmes naturels
4 KAUST - King Abdullah University of Science and Technology

This study focused on the photochemical degradation of two herbicides : isoproturon (IPU) and diuron (DIU), that are two of the most abundant phenylureas found in surface and ground waters in France and classified as prioritary substances by European Directive (DCE). Sunlight irradiation was performed by a solar simulator Atlas Suntest CPS+ (290 nm < λ < 700 nm, 250 W/m2). Pesticide concentrations used in the experiments were approximately 1 µM. Photodegradation efficiencies have been measured for aqueous solutions of IPU and DIU, in the presence of DOM (20 mg/L) isolated from surface waters. LC-MS analysis was performed in order to identify possible photoproducts.

Domains: Analytical chemistry; Environmental Sciences

Emilie Caupos, Patrick Mazellier, Jean-Philippe Croue. Photoinductive degradation of two pesticies by natural dissolved organic matter under simulated sunlight. TransCon2010, Sep 2010, Switzerland. ⟨hal-00822551⟩