11. Evaluation of Total Dissolved Solids (TDS) In Groundwater Around A Poultry Farm Using Electrical Resistivity Method and Geochemical Method

by M. A. Fakunle, G. I. Olatona, O. O. Alabi, J. T. Adeleke, O. F. Oladejo and W.B. Agbaje
Department of Physics, Faculty of Basic and Applied Sciences, Osun State University, Osogbo
Department of Pure and Applied Chemistry, Faculty of Basic and Applied Sciences, Osun State
University, Osogbo

Abstract
Most hands dug wells and boreholes at Isundunrin (a town) in Ejigbo Local Government Area of Osun State, South-West Nigeria were completed without physicochemical analysis of the exploited water. This study aimed at validating the electrical resistivity technique as an alternative to the geochemical technique to identify potential aquifers based on total dissolved solids (TDS). Four Schlumberger Vertical Electrical Soundings (VES) were carried out very close to four different
available hand-dug wells located within the premises of a poultry farm at Isundunrin on the longitude E04o 6ʹ 34ʺ – E04o 15ʹ 46ʺ and latitude N07o 51ʹ 52ʺ – N07o 51ʹ 56ʺ.
The apparent resistivity values obtained were later transformed to formation resistivity and layered thicknesses by curve matching and computer iteration. The formation resistivity was used to determine the TDS levels in the exploited groundwater. When the TDS of the geochemical analyses (GCA) was compared with the TDS from VES results, a strong correlation coefficient of R2 = 0.875 was obtained, which indicated that the geoelectric sounding can be an alternative technique to geochemical technique to estimate the TDS level in groundwater.

Keywords: Total Dissolved Solids, Electrical resistivity technique, geochemical technique