Scholarly works in Environmental Health Sciences

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Author: search.filters.author.Oyeku, O. T.

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    Speciation study of heavy metals in soil within the vicinity of a metal recycling factory at Ile-Ife, Southwestern Nigeria
    (2014-01) Oyekunle, J. A. O.; Adekunle, A. S.; Ogunfowokan, A. O.; Durosinmi, L. M.; Adelowotan, O.; Oyeku, O. T.
    A speciation study of Al, Cd, Cu, Mn, Pb and Zn in soil samples from a metal recycling factory in Ile-Ife Osun State, Nigeria, was carried out in order to assess the heavy metal pollution impact of the industrial processes on the immediate environment. Surface soil dust samples collected within the vicinity of the factory were subjected to a five-stage sequential extraction process. Levels of heavy metals in each fraction were determined using Flame Atomic Absorption Spectrophotometer (FAAS). The overall mean values obtained for the metals in the fractions gave the range: Al (0.03 ± 0.01 to 0.20 ± 0.01 μg/g ); Cd (0.03 ± 0.01 to 0.23 ± 0.02 μg/g) ; Cu (2.93 ± 0.02 to 18.30 ± 1.95 μg/g) ; Mn (17.33 ± 0.03 to 91.68 ± 2.90 μg/g); Pb (0.03 ± 0.01 to 0.43 ± 0.02 μg/g) and Zn (8.20 ± 0.01 to 35.08 ± 0.02 μg/g) . Both the contamination index and enrichment factor results indicated that all the soil samples were contaminated with Cd while a few sites showed Cu contamination. The mobility potential of the metals in the soil sample decreased in the order: Mn> Al > Zn > Cd > Cu >Pb (West) and Cd > Al >Pb> Zn >Mn> Cu (East). The study revealed that the soil around the metal recycling factory is contaminated with heavy metals, and if left unmonitored and controlled could lead to serious environmental risk in the future.
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    Health risk assessment of heavy metals in soils within the vicinity of a metal recycling factory in Southwestern Nigeria
    (2023-11) Oyekunle, J. A. O.; Oyeku, O. T.; Ogunfowokan, A. O.
    Industrial emissions from scrap metal recycling plants have been implicated as a major source of heavy metal (HM) contamination to soil and threatens the wellbeing of humans, and our terrestrial environment. This study evaluated the seasonal variations of surface soil concentration of Al, Cd, Cu, Mn, Pb and Zn within the vicinity of a metal recycling factory in Ile-Ife, Nigeria. Sixty-six surface soil samples were systematically collected at 0-15 cm depth across three consecutive months during dry and rainy seasons from the factory premises vicinity. Samples determination of heavy metals contamination were conducted using Atomic Absorption Spectroscopy. Public health risks were evaluated using Geo-accumulation Indices (Igeo), Average daily intake, health quotient (HQ) and health index (HI) standards not exceeding average shale limits and between acceptable range 1×10-4 and 1×10-6. Total concentration (mg/kg) of heavy metals in soil samples ranged from 0.50 Al to 2,219.10 μg/g Cu during wet season, while the range was from 0.59 Al to 3,019.10μg/g Cu in dry season. Results of non-carcinogenic risks of HMs for HQ (0.038) and HI (0.06) values were generally lower than one (<1) indicating no health risk. However, the HI values for children were higher than those of the adults. An exception to this is the high HI value for Cu at 1.23 and 1.11 for children and adult, respectively. The study concluded that the study area soil was heavily polluted with Cu and Cd, and the HI values for children indicated that children could suffer higher potential health risk than adults.
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    Heavy metal contamination of groundwater resources in a Nigerian urban settlement
    (Academic Journals, 2010) Oyeku, O. T.; Eludoyin, A. O.
    The aim of the aim of the study was to create awareness on the effect of dumpsite on groundwater in developing countries, especially Nigeria. In order to achieve this, water samples were obtained from 20 randomly selected hand dug wells and boreholes in the area, in February and August, 2006. 10 leachates samples were also obtained from the dumpsite. From these samples, pH and conductivity were determined using a pH/conductivity meter (Jenway model), while the concentrations of the heavy metals (Co, Fe, Pb and Cu) were determined using atomic absorption spectrophotometer (AAS). The trend of dispersion of each variable was demonstrated on Landsat ETM+ (2006) imagery using Erdas Imagine and ArcView GIS software. The study showed that the groundwater in the study area were generally alkaline (8.3 ±2.77) and contained Cu (0.02 ± 0.04 mg/l), Fe (4.23 ± 6.4 mg/l), Pb (2.4 ± 3.3 mg/l) and Co (1.03 ± 1.1 mg/l) concentrations that are higher than the permissible limits recommended by the World Health Organization (0.5, 0.1, 0.01 and 0.0002 mg/l, respectively; p > 0.05). The study concluded that the groundwater sources within 2 km radius of a major landfill will be vulnerable to the effect of landfill, if they are not adequately protected.