Le lac Albert est moins étudié en ce qui concerne l’évolution de la qualité de ses eaux. L’objectif de cette étude était de contribuer à la connaissance de quelques paramètres physico-chimiques des eaux littorales de la partie Sud-Ouest du lac Albert. Pour y parvenir, nous avons utilisé un kit multi-parameter AZ8603 pour le prélèvement, in situ, du pH, de l’oxygène dissous, de la conductivité électrique et de la température pendant un cycle de 24 heures à intervalle de 3 heures durant une année. Il ressort de cette étude que les moyennes de température, conductivité, oxygène dissous et pH sont respectivement de 29,07 °C, 631,65 μs/cm, 4,8 mg/l et 8,01. La concentration en oxygène dissous était plus élevée le jour que la nuit. La différence non significative de température entre le cycle diurne et nocturne montre que l’activité photosynthétique est l’élément explicatif de l’augmentation du taux d’oxygène dissous. Les mois d’avril et de mai se sont distingués par une forte température et une baisse de la concentration en oxygène dissous. Ceux de mars, août, octobre et novembre ont été marqués par une conductivité élevée corrélée positivement à la température.Mots clés : Eaux, lac Albert, physico-chimie, variation nycthémérale. 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.
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