Geosciences Research

Download PDF (1649 KB) PP. 46 - 58 Pub. Date: February 10, 2017

DOI: 10.22606/gr.2017.21006

• Cyril C. Okpoli^*
  Department of Earth Sciences, Adekunle Ajasin University, Akungba-Akoko, Ondo State, Nigeria.

The absence of Perennial River, semi-arid climatic condition and growing neediness of water increased the usage of water resources. In Oka municipality, all the water resources characters are sampled for its chemistry. Hydrochemistry of the water is influenced by geogenic and anthropogenic sources. Hence to assess the chemical characteristics of the water in the study area, a total of 20 water samples from different sources were collected and analyzed for physical parameters such as pH, conductivity and Total Dissolved Solids along with major cations and anions using standard procedures. The dominant cations and anions were, Na ˃ Ca ˃ Mg ˃ K and HCO ˃Cl> NO3 ˃ F ˃ PO4 ˃SO4 respectively. Hydro chemical facies demarcated were NaCl, CaNaHCO₃, CaHCO₃ and CaMgCl. The facies suggests ionic exchange, dissolution, silicate weathering and anthropogenic sources are responsible for the variation in water chemistry of the study area. The silicate group minerals show over equilibrium conditions sulphate and halide group minerals indicate under saturation condition. Stiff diagrams are used to distinguish the water types. Box and whisker plots and rank sum tests confirm that the five water types are distinct from each other. The three water types cluster together in three separate areas. Piper plots indicate that considerable cation exchange has occurred in the NaHCO₃. The Ca-rich recharge water exchanges Ca for Na and K, producing the NaHCO₃. The saturation values trend increases along the flow path.

Hydrogeochemistry, Oka, Municipality, water resources, facies.

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