Performance Evaluation Of Uv/h2o2 Process Applied To Treat ‎chlorpyrifos Ethyl In Aqueous Solution: Investigation Of The ‎genotoxicity Using Single Cell Gel Electrophoresis Assay

Résumé: This study aimed at evaluating the performance of chlorpyrifos ‎ethyl degradation (CP) by a 254-nm ultraviolet irradiation (UV) ‎or in the presence of hydrogen peroxide (H2O2) or during a ‎UV/H2O2 process. The degradation rates of chlorpyrifos ethyl, an ‎organophosphate (OP) used in agriculture, were respectively 24 ‎‎%, 83% and 93%. With the three types of treatments, the ‎degradation of this organophophate showed a pseudo first-order ‎kinetic pattern. The advanced oxidation process with a UV/H2O2 ‎treatment was found to be a technically feasible approach for the ‎removal of chlorpyrifos ethyl. In addition, the genotoxicity of the ‎studied compound, before and after several treatments, was ‎evaluated in vivo in the Mediterranean wild mussels – the ‎Mytilus galloprovincialis - using assay comet for the ‎quantification of DNA fragmentation. The percentage of ‎genotoxicity was 42% and 43% after an exposure to 0.66 mg kg-1 ‎body weight (bw) and a 0.33 mg kg-1 bw of CP, respectively. The ‎genotoxicity decreased at 20% when tested with the CP obtained ‎after a UV/H2O2 treatment. However, after a four-day biological ‎treatment with Pseudomonas peli, we observed a rate of ‎degradation of 98% and the percentage of genotoxicity was 8% ‎and 15% after an exposure to 0.66 mg kg-1 bw and a 0.33 mg kg-‎‎1 bw of CP, respectively.‎

Publié dans la revue: algerian journal of environmental science and technology