Hydrogeochemical Processes Influencing Groundwater Quality in the Black Volta Basin of Ghana

E. K. Ahialey ； B. K. Kortatsi ； G. K. Anornu ； E. A. Kaka ； G. Dartey

《Research Journal of Applied Sciences, Engineering and Technology》 11卷9期 (2015/11) Pp. 975-982

並列摘要

Hydrogeochemical processes influencing groundwater quality in the Black Volta Basin of Ghana have been studied. Groundwater samples were collected from 93 water points for physico-chemical analysis using standard methods. Major cation concentration was, generally, in the order of Ca^(2+)＞Na^+＞Mg^(2+)＞K^+ while major anion concentration followed the order HCO_3^-＞Cl^- ＞SO_4^(2-). Mineral weathering (rock dissolution) and ion exchange were the controlling factors of groundwater composition. Stability diagrams show groundwater to be largely in equilibrium with Montmorillonite and Kaolinite and are quite reminiscent of climatic conditions pertaining to the geographical region of the basin. Ca-Mg-HCO_3 is the main groundwater type in the basin. Minor water types are Na^- HCO_3 and Ca-Mg-SO_4. Principal Component Analysis (PCA), indicates that, HCO_3^- Ca^(2+), Mg^(2+), Na^+ and F^- contribute mainly to TDS and originate from the same-rock weathering.

並列關鍵字

Anion ； cation ； chemical parameters ； concentration ； groundwater type ； physical parameters