Détermination de la qualité physico-chimique des ressources en eau du bassin versant de la Loka à Bouaké, Centre de la Côte d'Ivoire

The objective of this study aims to evaluate the physicochemical quality of surface and well water based on measurements of Temperature (T°C), pH, Electrical Conductivity (EC), Suspended Matter (MES), Calcium (Ca2+), Magnesium (Mg2+), Sodium (Na+), Potassium (K+), Bicarbonates (HCO3-), nitrates (NO3-), nitrites (NO2-), ammonium (NH4+), Chlorides (Cl-), sulfactes (SO42-), orthophosphates (PO43-) in the Loka watershed. The physical parameters pH, EC and T were measured in situ with a WTW 3111 pH meter, a WTW 3110 conductivity meter and a WTW3110 oximeter. Chemical parameters, major elements, nutrient salts and heavy metals were all analyzed at the CIAPOL laboratory. The analysis of these parameters was carried out according to the protocol of Rodier 1994. The suspended solids (MES) were obtained by filtration on a fiberglass filter. The physicochemical analysis of the Loka watershed shows that the surface waters have an average temperature of 26.43°C. pH values vary between 5.5 and 6.8. Summary The objective of this study aims to evaluate the physicochemical quality of surface and well water based on measurements of Temperature (T°C), pH, Electrical Conductivity (EC), Suspended Matter The coductivity content is between 29 ÿS/cm and 116.2 ÿS/cm, which reflects weakly mineralized waters. Nitrate concentrations observed in surface waters vary from 0.24 mg/Lto 1.95 mg/L. Also, well water has a pH varying between 6.55 and 8.9 with an average of 7.35. These waters are also weakly mineralized and have nitrate contents of between 0.2 mg/L and 1.04 m/L. The average values of the different physicochemical parameters are generally below WHO quality standards. As a result, surface and well water on the whole can be used for the supply of drinking water but environmental monitoring remains important.