Chemical Characteristics and Assessment of Groundwater Quality Between Two Geological Group of the Lower Benue Trough ,Nigeria

Moses Oghenenyoreme Eyankware (Department of Geology, Ebonyi State University, Ebonyi State Nigeria)
Ruth Oghenerukevwe Eyankware Ulkapa (Department of Environment Management and Pollution Control, Nigeria Maritime University, Okerenkoko, Nigeria)
Obinna Chigoziem Akakuru (Department of Geology, Federal University of Technology, Owerri, Nigeria)
Oghenegare Emmanuel Eyankware (Department of Petroleum and Gas Engineering, University of Port Harcourt, Port Harcourt, Nigeria)


Hydrochemical studies was carried out within two geological groups of  the Albian to Turonian in age to evaluate factors that influences hydrochemistry of groundwater. To achieve this, 30 groundwater samples were collected. Parameters such as pH, Electrical Conductivity (Ec), Total Dissolved Solids (TDS), Total Hardness (TH) and hydrochemical characteristics (Na2+, K+, Ca2+, Mg2+, HCO3¯, NO3¯, Cl¯, CO23¯ and SO42¯) of groundwater were determined. Findings revealed that pH value for Asu River Group ranges from 5.3 to 7.5, and that of Eze Aku Group ranges from 4.1 to 7.9. It was observed that areas around the mines had low pH value. Analyzed results that was obtained were interpreted using various hydrogeochemical models. Parson plots showed that groundwater within the two geological groups fell within Ca˗Mg˗SO4 and Ca˗Mg˗Cl. Results from End˗member plots revealed that 96 % groundwater samples analyzed were categorize under carbonate weathering, 4 % fell under silicate weathering. Deductions from Gibbs revealed that interactions between groundwater and surrounding host rocks is the major processes responsible for chemical characteristics of groundwater, Diamond field plots further suggested that groundwater from the two geological group were categorized to be high in Ca + Mg & SO4 + Cl, plot of Ca2+/(HCO3¯ + SO42¯) against Na+/Cl¯  revealed that groundwater were considered to be within natural state for the two group. Plot of TDS against TH showed that groundwater was classified to be soft fresh water. The study revealed there was no significant difference between factors that influences groundwater within the two geological group. 


Weathering; Ion exchange; Group; Groundwater and Nigeria

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