Assessment of Heavy Metals of Boreholes and Hand Dug Wells in Ife North Local Government Area of Osun State, Nigeria

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Author(s) J.O. Jeje | K .T. Oladepo
Pages 209-214
Volume 3
Issue 4
Date April, 2014
Keywords Heavy metal, sanitation, water facilities, functional wells and boreholes and genetic cycle

Though some heavy metals are necessary in little quantities for the normal development of the genetic cycles, most of them become toxic at high concentrations. The major sources of heavy metal pollution in urban areas of Nigeria are anthropogenic while contamination from natural sources predominates in the rural areas. The study examined the status of heavy metals in wells and boreholes in Ife North Local Government Area of Osun State, Nigeria. Forty-one functional hands dug wells and nine boreholes in the area were sampled. Results showed that the concentrations ofzinc (Zn), lead (Pb), and manganese (Mn) were within WHO maximum permissible limits with mean values of 0.02 mg/l, 0.14 mg/l and 0.03 mg/l respectively. The proportion of cadmium (Cd) in the sampled wells and boreholes was zero, indicating the absence of these metals while the value of chromium was found significantly high (6.5 mg/l). The low levels of heavy metal contents in the sampled wells and boreholes showed they were not polluted and as such suitable for human consumption. In order to sustain quality status of wells and boreholes in the area, their routine monitoring and assessment by sanitary inspection officers was recommended.

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