Assessment of heavy metal pollution in soils and wells around municipal dumpsites in Osogbo metropolis

摘要

This study assessed the contributions of dumpsites to heavy metal pollution in soils at 10m and 20m and well water at 50m, 100m and 200m away from two dumpsites; Islae-Osun and Ofatedo. The pH of soils from dumpsites, 10m and 20m away from Ofatedo dumpsite were alkaline while pH of soils from 10m and 20m away from Isale-Osun dumpsite were acidic. pH of water from all locations were alkaline except for control which was acidic. The trend of heavy metal pollution in soils at the centre, 10m away from Isale-Osun and 20m away from Ofatedo dumpsites is Pb >Cu >Ni>Cr >Cd while at 20m away from Isale-osun dumpsite, centre and 10m away from Ofatedo dumpsite is Cu>Pb>Ni>Cr>Cd. The general trend of heavy metal pollution in well water at various distances from both dumpsites is Cu>Pb>Cr>Ni>Cd except at 200m away from Isale-osun dumpsite which is Cu>Pb>Cr>Cd>Ni. Heavy metal pollution index evaluated were higher than 100; the threshold warning suggesting that all wells were critically polluted with heavy metals. Factor analysis revealed that the main source of pollution was from dumpsites.