Spatio-temporal dynamics of the physical and chemical parameters of lake Ehuikro

This study was conducted on lake Ehuikro, located in Bongouanou (Côte d’Ivoire) from April 2017 to March 2018. Each month, the physico-chemical parameters of the water were measured at three (3) identified stations. In order to analyse its ecological status, the following equipment was used: Conductivity meter Model Sx713; Model Sx711 pH meter; Model Sx716 oximeter and Secchi disk, which made it possible to determine the annual average values: The dissolved solids rate was 154.13 ± 1.22 mg/L (long dry season) and 181.67 ± 3.78 mg/L (short dry season). Conductivity 250 ± 3.07 Ms/cm (short rainy season) and 297.75 ± 2.66 MS/cm (long dry season). Hydrogen potential 7.35 ± 0.13 (long dry season) and 8.09 ± 0.55 (short rainy season). Temperature 27.06 ± 0.67 °C (main rainy season) and 28.45 ± 0.05 °C (main dry season). Oxygen saturation level 42.67 ± 3.77% (minor dry season) and 67.93 ± 6.96% (long dry season). The dissolved oxygen level was 3.07 ± 0.64 mg/l (short dry season) and 5.24 ± 0.45 mg/l (long dry season). The phosphorus concentration was 0.03 ± 0.01 mg/l (short rainy season) and 0.06 ± 0.01 mg/l (long rainy season). The nitrate concentration was 0.01 ± 0.1 mg/L (long dry season) and 0.02 ± 0.1 mg/L (main rainy season). Transparency 0.44 ± 0.02 cm (main rainy season) and 0.68 ± 0.05 cm (minor dry season). Depth 2.71 ± 0.36 m (main dry season) and 4.20 ± 0.51 m (main rainy season). The results obtained reveal that certain physico-chemical parameters show signs of disturbance probably linked to local anthropogenic activities.