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Articles by O.J. Okunola
Total Records ( 3 ) for O.J. Okunola
  U.A. Awode , A. Uzairu , M.L. Balarabe , O.J. Okunola and Adewusi S.G.
  The  levels  and  distribution  of  Pb,  Cr  and  Cu  in  the  soils  and  pepper (Capsicum annuum) on the bank of River Challawa were investigated. The metal levels, expressed in mg kg-1 Dry Weights (DW) in the ranges: 60.00-143.30 for Pb (mean 114.79), 104.20-230.00 for Cr (mean 181.66) and 58.30-207.50 for Cu (mean 248.59) are obtained in soil samples; while 11.33-27.00 for Pb (mean 18.90), 10.40-35.10 for Cr (mean 20.04) and 7.56-21.07 for Cu (mean 14.52) are obtained in pepper samples. The relationship of metals was also examined for dependency upon some soil factor through the use of correlation analysis. Also, the results show the presence of correlation between metals in soil and pepper, which indicate possible transfer of these metals into the food chain. This has indirectly caused the accumulated of these heavy metals in the agricultural soils through irrigation and subsequently in the pepper planted in them, such that their concentrations in the soils and pepper (except Cu in pepper) exceed the recommended permissible limits.
  O.J. Okunola , A. Uzairu , G.I. Ndukwe and S.G. Adewusi
  To identify the concentrations of heavy metals in roadside environment , samples of roadside soils and vegetation were collected from 30 sites of 24 minor and major roads in Kaduna metropolis across two seasons. Subsequently, the concentrations of Cadmium (Cd) and Zinc (Zn) in the samples were analyzed using atomic absorption spectrophotometer. The mean concentration of Zn (mg kg-1 d.w.) in soil ranged from 45.37-237.96 and 24.21-123.14 for dry and wet season, respectively. While Cd mean concentration (mg kg-1 d.w.) in soil ranged from 1.96-6.80 and 0.38-2.44 for dry and season, respectively. Concentration of Zn in plant (mg kg-1) ranged from 27.78-185.19 and 15.43-138.89 for dry and wet season, respectively while concentration (mg kg-1 d.w.) of Cd ranged from 4.88-14.63 and 4.88-9.76 for dry and wet season, respectively. The Zn concentrations in both soil and plant leaves were found to be within ICRCL and FAO/WHO recommended limits, respectively. While Cd concentrations were found in excess of ICRCL and FAO/WHO recommended limits, respectively, this indicates potential health risk for human through the food chain. Comparative study showed that Cd and Zn values for soil and plant leaves were found high in the study area than the control area. This suggests that automobiles are a major source of these metals in roadside environment.
  O.J. Okunola , A. Uzairu , C.E. Gimba and J.A. Kagbu
  The aim of the study was to assess the impact of traffic volume on metal (Cd and Pb) concentration and to evaluate the mobility of the metals using sequential extraction. Particulate dust fall-out and roadside surface soil samples were collected from ten locations along major roads in the Kano metropolis, Nigeria in four seasons: Cool and dry, hot and dry, warm and wet and warm and dry. The samples collected were digested using standard methods and analysed using flame atomic absorption spectrophotometer. The results of metal inter-relation analysis on both samples revealed positive correlations for Cd and traffic volume and the metals for the studied seasons while positive correlation was found for Pb during warm and wet and warm and dry seasons. Positive correlation between the metals (Cd and Pb) and traffic confirmed the fact that automobiles are major source of the presence of these metals in the roadside environment. Also, the results showed that the concentrations in the mobile phase (water soluble, exchangeable and carbonate bound fractions) were generally high for Cd (29.49-92.7%) and Pb (26-76.4%) with the highest obtained during warm and wet and warm and dry seasons. This suggests potential toxicity to residential and food vendors adjacent to major roads in Kano metropolis. These could be direct or indirect pathways of metal in humans.
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