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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 HCO3 >Cl >SO4 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-HCO3 is the main groundwater type in the basin. Minor water types are NaHCO3 and Ca-Mg-SO4. Principal Component Analysis (PCA), indicates that, HCO3 Ca 2+ , Mg 2+ , Na + and F contribute mainly to TDS and originate from the same-rock weathering.

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