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Geochemical analyses of domestic groundwater sources within Okeagbe-Akoko, South-western Nigeria have been conducted. A total of twenty (20) water samples, sourced from hand-dug wells, deep wells and streams, were analyzed for their physico-chemical characteristics, with the aim of determining their suitability for local domestic consumption. The physico-chemical analyses involved the determination of Electrical Conductivity (EC), Acidity (pH), Total Dissolved Solids (TDS) and the determination of the concentration of a heavy metals suite consisting of Zinc (Zn), Nickel (Ni), Cadmium (Cd), Copper (Cu), Lead (Pb), and Chromium (Cr), using the Atomic Absorption Spectrometry (AAS). Result ranges obtained for the physical parameters were pH: 5.82 to 7.08, total dissolved solids: 43 to 492 mg/l, and electrical conductivity: 71.681 to 820.164 µs/cm. The heavy metal concentrations for Cu and Zn ranged from 0.001 to 0.014 mg/l and 0.001 to 0.030 mg/l respectively. Ni, Cd, Pb and Cr were not detected in any of the water samples. All determined physico-chemical parameters were well below the current World Health Organization (WHO) acceptable limits for safe water sources. This indicates that the domestic water sources in the area are relatively contaminant free and safe for domestic use. The Cu 2+ concentration distribution pattern however, provides insight into the likely nature of heavy metal contaminant migration path in the event of an impact.

Geochemical Analyses of Domestic Groundwater Sources in Okeagbe-Akoko, Southwestern Nigeria.