PHYTOCHEMICAL, ANTIOXIDANT AND ANTIMICROBIAL EVALUATION OF NIGERIAN KALANCHOE PINNATA (LAM.) ROOTS APPLICATION OF ELECTRICAL RESISTIVITY METHOD FOR GROUNDWATER INVESTIGATION IN A BASEMENT ROCK REGION: A CASE STUDY OF GBODOMI SOUTHWESTERN, NIGERIA

Abstract

A geo-resistivity exploration has been carried out for groundwater exploration within Gbodomi in Ipaiye district of Moro Local Government Area, Kwara State, Nigeria. The area lies within the Basement Complex terrain of South Western Nigeria and bounded by longitudes 3°E and 6°E and latitudes 7°N and 10°N.A total of 16 VES were carried out across three profiles using the Schlumberger electrode array configuration, with current electrode separation (AB/2) varying from 1m to 80m.The data obtained were subjected to interpretation by partial curve matching and then by computer iteration and the results correlated with records from existing wells, the interpretation of the VES data also assisted in the characterization of three to four geo-electric layers from which the aquifer unit was delineated. The layers are divided into topsoil, laterites, weathered basement and fresh bed rock. The weathered/fractured basement is the aquifer unit delineated across the area. The thickness of the weathered basement unit varies from 10.1m to 38.3m in the area. On the basis of geo-electric parameters, regolith resistivity and reflection coefficient data of the study area were classified into high, intermediate and low groundwater potential zones.