COMPARATIVE ASSESSMENT OF HEAVY METALS IN BOREHOLE AND WELL WATER AT OLOUNDE ESTATE, IBADAN, OYO STATE, NIGERIA

Abstract

Water pollutants spread faster within biological components of the environment. Heavy metal is known to have a longer lifespan in our environment, thereby, posing a severe threat to human and other living organisms in contact with it. The study was conducted to determine the concentration level of following heavy metals: iron, cadmium, manganese, chromium, zinc, lead, copper in borehole and well water. This research was carried out at Olounde estate a residential area in Ibadan. Three borehole water and three well water were sampled. A random sampling technique was used, at about 16 m difference to each other. From point zero to borehole A(16.4 m), from borehole A to borehole B(16.5 m), from borehole B to borehole C (16.3 m), from borehole C to well A (16.8 m), from well A to well B (16.2 m), from well B to well C (15.3 m). The result of this research shows that high heavy metal concentration is present in the borehole water and well water in the study area. Zinc was identified to be the highest heavy metal concentration (0.24 mg/l), followed by iron (0.23 mg/l), while Chromium concentration was the lowest (0.001 mg/l). Cadmium presence was only found in Borehole A (0.005 mg/l).Iron and Chromium were very high above the WHO and USEAP permissible level of heavy 2+ metals in water. Borehole had the highest heavy metal concentration (zn ) at borehole C (0.24 mg/l).