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Human activities resulting from increase in population, industrialization and urbanization in Ibadan, Nigeria, have led to subsequent deposition of wastes from different parts of the city on Lapite dumpsite is no doubt a threat to the ground water and biodiversity near the area. As such this study was carried out to determine the level of heavy metal leaching from the dumpsite on well water near the dumpsite. Water sample was collected from the well located near the dumpsite for the assessment of metal leaching from the dumpsite wastes into the well water. Heavy metals such as Chromium, Cadmium, Lead, Nickel, Zinc, Copper and Manganese were determined by Atomic Absorption Spectrophotometry (AAS) after digestion with aqua regia. The results show that the heavy metals are high for Pb (0.58 mg/L) and Mn (1.18 mg/L), which is above the maximum acceptable limits by WHO and NAFDAC (0.01 mg/L and 0.0 mg/L respectively) for Pb and (0.4 mg/L and 0.0 mg/L respectively) for Mn. Because of the higher concentration and toxic nature of these heavy metals, an attempt should be directed to effective environmental management and the protection of the water quality by disposing waste effectively. Water should be treated before use and also tree planting should be encouraged in order to accumulate relatively large amounts of these elements by foliar absorption.

Heavy Metal Effect on Well Water and Biodiversity near Lapite Dumpsite in Ibadan, Oyo State, Nigeria.