Fatai Olayiwola OKEOLA, is a Reader in the Department of Chemistry, Faculty of Physical Sciences, University of Ilorin with more than 20 years of university teaching, research, and administrative experience.
He has served in various capacities in the department, faculty and in the university at large. His areas of research interest cover Physical Chemistry, Kinetic and Thermodynamic studies of Chemical Processes, Adsorption studies (Surface Chemistry) and also include crude oil and petroleum products. He has to his credit many publications in reputable outlets covering journals, edited conference proceedings and chapters in books. He has successfully supervised several undergraduate projects and Master dissertations.
Investigation on the Quality of Prolonged Storage of Packaged Water Commonly Produced in North Central, Nigeria Fatai OKEOLA, Taofeeqat ABU, Aminat MOHAMMED, Muyiwa OROSUN, Abdullahi BABA, et al. Journal of the Turkish Chemical Society Section A Chemistry, 2023 This study investigated the effects of prolonged storage conditions on the physicochemical parameter, toxic metals, microbial loads, and health risks assessment of randomly selected three brands of sachet and bottled water in North Central, Nigeria. One hundred eighty samples of water brands (sachet and bottled) were collected from 10 different factories and were grouped into three. They were analyzed immediately (initial), being exposed to mild sunlight (stored with a container) and exposed to intense sunlight (stored without a container) conditions for six weeks. The results of the physicochemical parameters (sachet and bottle) were within the limits set by the World Health Organization (WHO) and the Standard Organization of Nigeria (SON). While the results of heavy metals analysis for both sachet and bottled water recorded 0.15 - 0.51 mg/L (0.10 mg/L , 0.05 mg/L), 0.13 - 0.38 mg/L (0.015 mg/L, 0.01 mg/L) and 0.55 - 1.11 mg/L (0.03 mg/L, 0.3 mg/L) for Chromium (Cr), Lead (Pb) and Iron (Fe) respectively, as compared to the permissible limits (values in the bracket for each heavy metals) set by WHO and SON. The microbial analysis results ranged between 6.58 - 124.51 Cfu/100 mL, 0.52 - 37.56 Cfu/100 mL, 0.07 - 5.00 Cfu/100 mL, 0 - 2.07 Cfu/100 mL for Total Bacteria Count (TBC), Total Coliform Count (TCC), Faecal Coliform Count (FCC) and Total Fungal Count (TFC) respectively, which showed no effective quality control system. Incremental lifetime cancer risk (ILCR) assessment revealed a carcinogenic health risk to the populace drinking this water. The study concludes that water stored under sunlight for a long period is not good for human consumption and therefore adequate monitoring by the appropriate agencies is emphasized.
RISK ASSESSMENT OF HEAVY METALS AND POLYCYCLIC AROMATIC HYDROCARBONS IN GROUND WATER SAMPLES AROUND THE VICINITY OF AN ASPHALT PLANT IN NORTH CENTRAL, NIGERIA A.A. Mohammed, M.M. Orosun, F.O. Okeola, M.A. Raji, G.O. Tesi, et al. Bulletin of the Chemical Society of Ethiopia, 2023 In this study, the concentration and risk of heavy metals and polycyclic aromatic hydrocarbons (PAHs) in 9 composite samples around the vicinity of an Asphalt plant in North Central, Nigeria, was evaluated. Aqua-regia wet digestion was used for heavy metals extraction in the water samples while atomic absorption spectrometry was used quantification. For PAHs, liquid-liquid extraction was used for extraction while gas chromatography-mass spectrometry was used for quantification of PAHs in the extracts. The risk assessment was estimated using the hazard index (HI) and incremental lifetime cancer risk (ILCR) in all the samples studied. The results showed that Cd and Cr were present in concentrations higher than their permissible limits in water set by World Health Organization, while Pb was not detected. Total concentration of 14 PAHs ranged between 6.47–390 mg L-1 and were within the WHO permissible limits. High molecular weight PAHs were dominant (71.54%) relative to low molecular weight PAHs (28.46%). The risk assessment results revealed that 100% ILCRtotal values recorded for heavy metals were higher than the recommended limit. While 37.5% of ILCRtotal values recorded for PAHs were higher than the recommended values, implying that residents are exposed to health risks from both metals and PAHs.
 KEY WORDS: Asphalt plant, Heavy metals, Polycyclic aromatic hydrocarbons,Water, Risk assessment
 Bull. Chem. Soc. Ethiop. 2023, 37(6), 1337-1349. DOI: https://dx.doi.org/10.4314/bcse.v37i6.4
PURIFICATION OF A PARGASITE RICH GANOPHYLLITE-OLIGOCLASE ORE BY OXALIC ACID SOLUTION: STATISTICS FOR INDUSTRIAL CONSIDERATIONS Journal of Chemical Technology and Metallurgy, 2022
Comparison of sorption capacity and surface area of activated carbon prepared from jatropha curcas fruit pericarp and seed coat O.F. Okeola, E.O. Odebunmi, O.M. Ameen Bulletin of the Chemical Society of Ethiopia, 2012 Activated carbons were prepared from fruit pericarp and seed coat of Jatropha curcas using KOH and NaCl as activating agents leading to the production of four samples of activated carbons JPS, JPP, JCS and JCP. The adsorption capacity based on adsorption of methylene blue was determined for each sample. A further study of adsorptive properties of the most efficient activated carbon (JPS) was made by contacting it with standard solutions of methylene blue, acetic acid and potassium permanganate. The effects of mass of active carbon used, initial concentration of the solute and the pH of the solution on adsorption performance were investigated. Ash content and percentage fixed carbon were determined for two of the activated carbons (JPS and JCS) with the highest adsorptive capacity. Equilibrium study on adsorption was carried out and the adsorption data were analyzed using the Langmuir isotherm. The results obtained indicate that activated carbons from the fruit pericarp and the seed coat of J. curcas can be used as high performance adsorbents with the fruit pericarp activated carbon showing the higher adsorption capacity. The adsorption data fitted well to the Langmuir model and adsorptive area of 824-910 m 2 /g was obtained for the activated carbon.
Comparative assessment of physicochemical properties of common automobile consumable oils Advances in Environmental Biology, 2011
Freundlich and Langmuir isotherms parameters for adsorption of methylene blue by activated carbon derived from Agrowastes Advances in Natural and Applied Sciences, 2010
Comparison of Freundlich and Langmuir isotherms for adsorption of methylene blue by agrowaste derived activated carbon Advances in Environmental Biology, 2010
Comparative study of physico chemical parameters of water from a river and its surrounding wells for possible interactive effect Advances in Environmental Biology, 2010
Comparative study of kinetics of catalysed oxidation of glucose and galactose by hexacyanoferrate (III) ion and copper sulphate in alkaline medium Advances in Environmental Biology, 2010
