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Le lac Albert est moins etudie en ce qui concerne l’evolution de la qualite de ses eaux. L’objectif de cette etude etait de contribuer a la connaissance de quelques parametres physico-chimiques des eaux littorales de la partie Sud-Ouest du lac Albert. Pour y parvenir, nous avons utilise un kit multi-parameter AZ8603 pour le prelevement, in situ, du pH, de l’oxygene dissous, de la conductivite electrique et de la temperature pendant un cycle de 24 heures a intervalle de 3 heures durant une annee. Il ressort de cette etude que les moyennes de temperature, conductivite, oxygene dissous et pH sont respectivement de 29,07 °C, 631,65 μs/cm, 4,8 mg/l et 8,01. La concentration en oxygene dissous etait plus elevee le jour que la nuit. La difference non significative de temperature entre le cycle diurne et nocturne montre que l’activite photosynthetique est l’element explicatif de l’augmentation du taux d’oxygene dissous. Les mois d’avril et de mai se sont distingues par une forte temperature et une baisse de la concentration en oxygene dissous. Ceux de mars, aout, octobre et novembre ont ete marques par une conductivite elevee correlee positivement a la temperature.Mots cles : Eaux, lac Albert, physico-chimie, variation nycthemerale.   English Title: Physico-chemical of coastal waters of the South-Western part of Albert Lake, DR CongoThe Albert Lake is barely investigated with regard to the evolution of the quality of its waters. The objective of this study was to contribute to the knowledge of some physico-chemical parameters of the coastal waters of the South-Western part of the Albert Lake. To reach the above objective, a kit multi AZ8603 parameter was used to record, in situ, the pH, the dissolved oxygen, the electric conductivity and the temperature during a cycle of 24 hours, with 3 hours interval. This was done during a year. This survey evidenced that the averages of temperature, conductivity, dissolved oxygen and pH were respectively 29.07 °C, 631.65 μs/cm, 4.8 mg/l and 8.01. The concentration of dissolved oxygen was higher during the day as compared to its concentration in the night. The slight difference of temperature between the diurnal and nocturnal cycle showed that the photosynthesis activity was responsible of the increase of the dissolved oxygen rate. The months of April and May were characterized by relatively higher temperature and a lower concentration of dissolved oxygen. Those of March, August, October and November showed higher conductivity correlating positively to the temperature.Keywords: Waters, Albert Lake, physico-chemistry, circadian variation.

Qualité physico-chimique des eaux littorales de la partie Sud-Ouest du Lac Albert, RD Congo