Geochemical Characterization of Phraetic Aquifers in Area of Sango, Southwestern, Nigeria

This research work assesses the geochemical characteristics of aquifers in Sango area of Ogun State, Western part of Nigeria with depth ranging from 26.0 to 62.0 m. Water samples were collected from fourteen different boreholes acrossed the town and analyzed for: pH, electrical conductivity (EC), total dissolved solids (TDS), anions (bicarbonate (HCO ), sulphate (SO ), chloride (Cl ), nitrate (NO ) as nitrogen nitrate) and cations 3 4 3 2(sodium (Na ), potassium (K ), Calcium (Ca ), zinc (Zn ), lead (Pb ), cadmium (Cd ), iron (Fe ), chromium + + 2+ 2+ 2+ 2+ 2+ (Cr ), copper (Cu ), manganese (Mn ), magnesium (Mg ) and cobalt (Co )). Results were compared to World 2+ 2+ 2+ 2+ 2+ Health Organization (WHO) standards. Pearson correlation coefficient was used to ascertain relationship between some geochemical parameters and depth. Results indicated that parameters such as Mn (0.05-0.55 2+ mg L ), Pb (0.00-0.09 mg L ), Cd (0.009-0.03 mg L ) and NO (8.0-54.0 mg L ) were higher than WHO 1 2+ 1 2+ 1 1 3 standards indicating anthropogenic infiltration of pollutants into the aquifers. Pollution of aquifers could be serious and pose threat to public health when water from it is consumed without treatment.