Browsing by Author "Oyekunle JA"

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    Bromate and trace metal levels in bread loaves from outlets within Ile-Ife Metropolis, Southwestern Nigeria
    (2014) Oyekunle JA; Adekunle AS; Ogunfowokan AO; Olutona GO; Omolere OB
    Bread loaves randomly sampled from nine outlets and bakeries within Ile-Ife were analysed to determine their safety levels for human consumption with respect to bromate and trace metal contents. Bromate determination was carried out via spectrophotometric method while trace metals in the digested bread samples were profiled using Flame Atomic Absorption Spectrophotometer. Bromate levels in the analyzed bread samples ranged from 2.051 ± 0.011 μg/g to 66.224 ± 0.014 μg/g while the trace metal levels were of the order: 0.03–0.10 μg/g Co = 0.03–0.10 μg/g Pb < 0.23–0.46 μg/g Cu < 2.23–6.63 μg/g Zn < 25.83–75.53 μg/g Mn. This study revealed that many bread bakers around Ile-Ife had not fully complied with the bromate-free rule stipulated by NAFDAC contrary to the “bromate free” inscribed on the labels of the bread. The bread samples contained both essential and toxic trace metals to levels that could threaten the health of consumers over prolonged regular consumption.
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    Determination of polycyclic aromatic hydrocarbon levels of groundwater in Ife north local government area of Osun state, Nigeria
    (2017) Adekunle AS; Oyekunle JA; Ojo OS; Maxakato NW; Olutona GO; Obisesan OR
    This study determined the presence and levels of Polycyclic Aromatic Hydrocarbons (PAHs) of groundwater in Moro, Edun-Abon, Yakoyo and Ipetumodu communities in Ife-North Local Government Area of Osun State. This was with a view to create public awareness about the safety of groundwater as a source for domestic purposes (e.g., drinking, cooking etc.) in non-industrial area. Water samples were collected on seasonal basis, comprising of three months (August–October) in the wet season and three months (December–February) in the dry season. The PAHs in the water samples were extracted with n-hexane using liquid–liquid extraction method, while their qualitative identifications and quantitative estimations were carried out with the use of gas chromatography. Levels of PAHs detected showed predominance of light PAHs (less than four fused rings) for both wet and the dry seasons. Higher concentrations of PAHs were recorded during the wet season than the dry season. The study concluded that the groundwater in the communities was contaminated with light PAHs and the total PAHs in this area exceeded the maximum permissible limit of 10μgL−1 recommended by World Health Organization (WHO) for safety of groundwater.
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    Water and sub-soil contamination in the coastal aquifers of Arogbo, Ondo State, Nigeria
    (2021) Awoyemi MO; Ajama OD; Adekola SA; Arogundade AB; Fashina CD; Akinlade GO; Oyekunle JA
    Study Region Arogbo Community, Ondo State, Nigeria. Study Focus In this study, groundwater and subsoil contamination within the coastal aquifers of Arogbo was investigated in order to determine the nature and sources of contamination, and its variation with season. In dry and wet seasons, water samples were analysed for their physico-chemical and bacteriological properties while soil samples were collected at depths of 0–0.5 and 0.5–1.0 m to determine the elemental concentration of heavy metals and their variation with depth. New Hydrological Insights for the Region The data obtained showed that the aquifer is shallow with a depth to water table ranging from 0.37 to 1.20 m. The hydro-chemical results revealed that the quality of water have been greatly impaired by the presence of contaminants such as Fe, Mn, and brackish water while the bacterial analysis showed that only few water samples were fit for human consumption. The results of soil analysis revealed the presence of anthropogenic contaminants such as Cd, Cu and Zn. This study concluded that the soil contaminants had no significant impact on the contamination level of water within the study area. Rather, terrestrial sources of iron and manganese were the major contaminants responsible for the high level of colouration of surface water and groundwater within the study area. These contaminants could pose serious health hazards to residents of the community.