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Evaluation of the Physicochemical Quality of Dayet Erroumi Lake in Low Water Period (Khemisset, Morocco)

Dayet Erroumi lake is a site of biological and ecological interest. It is the only permanent low-lying continental lake in Morocco. The objective of this work is to assess the physicochemical quality of the lake in low water period. Six samples, noted from S1 to S6, were taken all around the lake from the banks. The physicochemical analysis of the water was carried out in November 2019. The temperature, pH, dissolved oxygen and electrical conductivity were measured in situ. The chemical composition was determined in the laboratory. The obtained results show that the pH of water is basic. The concentration of dissolved oxygen, nitrates and sulfate shows that the water is of good quality according to Moroccan surface water guidelines. The chemical composition is characterized by a dominance of chlorides and sodium. The chloride concentration is high. The value of the electrical conductivity (4 to 5 mmhos / cm) and of the total concentration of dissolved salts analyzed shows that the salinity of the water (> 2500 mg / l) is high. Water is therefore classified as brackish. This high mineralization is explained by the dissolution of the evaporitic rocks of the region.