Integrated geoelectric and hydrochemical assessment of Ilokun dumpsite, Ado Ekiti, in southwestern Nigeria

Olayiwola G. Olaseeni, Oluseun A. Sanuade, Solomon S. Adebayo, Michael I Oladapo


A geophysical and hydrochemical assessment of Ilokun dumpsite in Ado Ekiti, southwestern Nigeria was conducted to assess its impact on groundwater quality. Eighteen Vertical Electrical Sounding (VES) were carried out, 17 within the dumpsite and one outside the dump periphery as the control. Three dipole-dipole traverses were also established, two within the dump periphery and one as the control outside the dump periphery. Hydrochemical analysis was carried out on water samples. The geoelectric sections and inverted 2D resistivity structures delineated three subsurface geologic layers made up of topsoil, weathered layer
and fractured/fresh basement. The topsoil and weathered basement aquifer units within the dumpsite possessed low layer resistivity values of <60 Ωm and <100 Ωm, respectively. Hydrochemical analysis of water samples from the area around the dumpsite confirmed the groundwater pollution from 2.5 to >15 m deep. The pollution migration showed a predominantly southerly flow in line with the regional direction of groundwater flow. This suggests that the groundwater within the study area may constitute a major health risk for humans and require immediate attention by the authorities.


Geophysical, hydrochemical; dumpsite; pollution; groundwater

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