Assessment of heavy metals concentrations in soils of Shakaya Estate dumpsite, Ilorin, Southwestern Nigeria
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Date
2022
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Nigerian Mining and Geosciences Society (NMGS)
Abstract
Indiscriminate dumping of domestic wastes has been known to adversely affect the environment and ultimately the health of humans thus leading to the study of various dumpsites in Nigeria. This study was aimed at assessing the concentration of some heavy metals within the Shagaya Estate dumpsite, Ilorin, Southwestern Nigeria to determine their level of contamination and/or pollution. Twenty representative soil samples were obtained from the dumpsite at about 20cm depth, air dried, pulverized, sieved to <63µm and analyzed for concentrations of Cadmium (Cd), Lead (Pb), Mercury (Hg), Arsenic (As), Selenium (Se) using Atomic Absorption Spectrometry (AAS). The results from the analysis were compared with average crustal value to determine level of enrichment; Geo-accummulation factor (Igeo) and Contamination Factor were calculated to determine their contamination level while Pollution Index (PI) was done to understand the pollution level of these heavy metals within the study area. Concentration ranges for selected heavy metals were; Pb (14.6-77ppm), As (0.46-1.38ppm), Cd (0.04-0.13ppm), Hg (0.04-0.13ppm) and Se (0.06-0.13ppm) which revealed the concentration of heavy metals in the order of Pb <As < Cd <Hg< Se with Pb, Hg and Se having higher concentrations when compared with average crustal values; Igeo values indicated that all samples were uncontaminated with As, Cd and Hg while Pb and Se were moderately contaminated; CF calculations showed moderate contamination of Pb (2.87), Hg (1.07) and Se (2.04) while PI had a value of 2.25 indicating that the study area is currently heavily polluted. These results showed that the dumpsite is moderately contaminated and heavily polluted which is not safe as there are residential houses around the dumpsite.
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Citation
Shakirat O. Mustapha, Jimoh Ajadi, and Bernard B. Mayaki (2022). Assessment of heavy metals concentrations in soils of Shakaya Estate dumpsite, Ilorin, Southwestern Nigeria. In Proceedings of the 57th Annual International Conference of Nigerian Mining and Geosciences Society (NMGS) Garden City 2022. Vol. 3. 216-222