QUALITY ASSESMENT OF GROUNDWATER IN LAGOS STATE: A CASE STUDY OF AMUWO ODOFIN/FESTAC METROPOLITAN AR

Session: Poster Session

Rose Anthony Alani, Department of Chemistry, University of Lagos, [email protected]
Akinrinade Olumide, Department of Chemistry, University of Lagos, [email protected]
Olaifa Balikis, Department of Chemistry, University of Lagos, [email protected]
DAVID ALANI, University of Lagos, [email protected]

Abstract

The increase in urbanization and extended industrialization has lead to a serious treat of surface water for drinking purpose in Africa with groundwater now serving as a reliable substitute. Amuwo-odofin / Festac Metropolitan Area (A/FMA) has a number of factors that could possibly affect the integrity of this groundwater sources. Such factors include the surrounding canals which accommodate tributaries and are potential sinks of pollutants that could leach into the aquifer. This study assessed 30 groundwater samples randomly collected from boreholes and hand dug wells in A/FMA. Physico-chemical parameters comprising: pH, conductivity, turbidity, TDS (total dissolved solid), TS (total solid), temperature, total acidity, total alkalinity, Chloride, Hardness, COD (Chemical Oxygen Demand) and DO (Dissolved Oxygen); as well as 7 heavy metals (Fe, Cr, Cd, Zn, Mn, Cu and Pb) were determined in each sample. The dominant metals were found in the order: Fe > Cd > Pb. 76.7 % and 60.0 % of the water samples indicated lead and cadmium respectively above the WHO regulatory standards – 0.01 mg/L and 0.003 mg/L.  Cr, Cu and Mn were all determined very low relative to the health-based guidelines. Zn was not found in any of the samples. The groundwater of A/FMA have