Identifying sources and distribution of organic pollutants in a Moroccan river: Characterization of dissolved organic matter by absorption, excitation–emission fluorescence and chemometric analyses
2024
Ba-Haddou, Hassan | Taoussi, Omar | Ait Lyazidi, Saadia | Coquery, Marina | Masson, Matthieu | Haddad, Mustapha | El Bakkali, Abdelmajid | Margoum, Christelle | RiverLy - Fonctionnement des hydrosystèmes (RiverLy) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | جامعة مولاي إسماعيل = Université Moulay Ismaïl (UMI) | Université de Sherbrooke = University of Sherbrooke [Sherbrooke] (UdeS) | This project was supported by the Moroccan CNRST (National Center for Scientific and Technical Research) in the framework of grants URL CNRST No. 7, CNRST-FRQ/478 and RS-12. The project also received funding from the French Ministry of European and Foreign Affairs (MEAE), the French Ministry for Higher Education and Research (MESR), and the Moroccan Ministry of Higher Education, Scientific Research and Innovation (MESRSI), as part of the bilateral French – Moroccan program PHC TOUBKAL 2021 (grant number: 45858PH). | Elsevier | PHC TOUBKAL
International audience
显示更多 [+] 显示较少 [-]英语. This study investigates surface water contamination of Ben-Kazza River in Morocco, fed by effluents from an adjacent lagoon-based wastewater treatment plant (WWTP) and seasonally by industrial effluents, and which occasionally serves to irrigate agricultural fields. This study has two purpose: i) to track the main sources of contamination through the evolution of dissolved organic matter (DOM) characteristics along the watercourse, and ii) to characterize the WWTP influents and effluents with a focus on the efficiency of the lagoon treatment. We characterized a total of 495 water samples across the watercourse and from the inlet and outlet of the WWTP, using UV–visible absorption and excitation–emission fluorescence coupled with chemometric analyses. Absorption indicators and fluorescence indices were calculated and compared across sampling points. Results highlight spatial shifts together with temporal changes in DOM. PARAFAC identified components that varied between protein-like, humic-like and anthropogenic-like fluorophores along the river, permitted to trace the anthropogenic components and their sources. The lagoon treatment appeared to better remove fresh organic material than humic material: fluorescence intensity decreased by 68% for peak T1 and by 22% for peak C. Maximum fluorescence intensities (Fmax) decreased across all PARAFAC components, leading to more than 55% reduction of ΣFmax.
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