Famara Seydi Ba^1,, Diadioly Gassama¹, Alioune Ly², Baba Ngom², Séni Tamba²

Water brings to every living being a good health and the well-being of his organism. It allows them to meet their basic needs and especially their diet. But, for a beneficial use, the optimal quality of the water is crucial. Here in Senegal most of the regions are fed by the lake Lac de Guiers and the latter is threatened by industrial discharges, hydroagricultural activities that cause a gradual degradation of its quality. In this study, we made a characterization of the physicochemical parameters of the waters of Keur Momar Sarr in order to have visibility on the evolution of ions, temperature, pH, conductivity etc. Then, a comparative study between certain measured chemical elements and the standards of discharges or potability was made. The results obtained show that the surface waters of Keur Momar Sarr are of excellent quality with a dominance of a chlorinated and sulphated calcium facies. We observed a dominance of chloride ion at the anion level and magnesium ion at the cation level. The analyzes also showed that the carbon dioxide content is high at point 5, which corresponds to the water already treated as well as the lead and sodium, compared to the four other points located before treatment of the surface water of the lake. However, the iron, nitrate and phosphate contents are low by WHO standards. It should be noted that the water intended for the drinking water supply of regions downstream from the treatment plant deserves improvement. In fact, almost all of these physicochemical parameters do not comply with the standards established by the World Health Organization.

Guiers Lake, characterization, physicochemical parameter, quality, potability