Characterization by fluorescence of dissolved organic matter in rural drinking water storage tanks in Morocco

Author:

Aziz Faissal1,Ouazzani Naaila1,Mandi Laila1,Assaad Aziz2,Pontvianne Steve2,Poirot Hélène2,Pons Marie-Noëlle2

Affiliation:

1. Laboratoire d'Hydrobiologie, Ecotoxicologie & Assainissement (LHEA, URAC 33), Faculté des Sciences Semlalia, Marrakech, Morocco and Centre National d'Etudes et de Recherche sur l'Eau et l'Energie, Université Cadi Ayyad, Marrakech, Morocco

2. Laboratoire Réactions et Génie des Procédés, UMR 7274 CNRS, Université de Lorraine, 1, rue Grandville, BP 20451, Nancy 54001, France

Abstract

Abstract Water storage tanks, fed directly from the river through opened channels, are particular systems used for water supply in rural areas in Morocco. The stored water is used as drinking water by the surrounding population without any treatment. UV-visible spectroscopy and fluorescence spectroscopy (excitation-emission matrices and synchronous fluorescence) have been tested as rapid methods to assess the quality of the water stored in the reservoirs as well as along the river feeding them. Synchronous fluorescence spectra (SFS50), collected with a difference of 50 nm between excitation and emission wavelengths, revealed a high tryptophan-like fluorescence, indicative of a pollution induced by untreated domestic and/or farm wastewater. The best correlations were obtained between the total SFS50 fluorescence and dissolved organic carbon (DOC) and biological oxygen demand, showing that the contribution of humic-like fluorescent substances cannot be neglected to rapidly assess reservoir water quality in terms of DOC by fluorescence spectroscopy.

Publisher

IWA Publishing

Subject

Infectious Diseases,Microbiology (medical),Public Health, Environmental and Occupational Health,Waste Management and Disposal,Water Science and Technology

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