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Articles by A.O. Ogunfowokan
Total Records ( 3 ) for A.O. Ogunfowokan
  A.O. Ogunfowokan , O.I. Asubiojo , A.A. Adeniyi and E.A. Oluyemi
  Moss samples Barbula lambarenensis (P. Vard) were taken along major and minor roads of Ile-Ife, in the South Western part of Nigeria and were analysed after triple acid digestion for the trace metals: Lead, Zinc and Copper by Graphite Furnace Atomic Absorption spectrophotometry. The triplicate field data were averaged to yield mean concentrations at each sample location. The lead and zinc levels ranged from 196.8 (0.04)-108.5 (0.03) μg g-1 and from 593.1 (0.02)-35.0 (0.10) μg g-1 dry weight, respectively in the moss samples. These results from the analysis of the moss samples show that Pb and Zn levels were generally higher in areas with relatively high traffic density than low traffic density areas. Similar studies on Copper gave lower values (47.0 (0.01)-10.1 (0.01) μg Cu g-1) dry weight in the samples which did not show any correlation with traffic density. Analysis of standard plant reference materials (BCR:CRM 062) gave results Pb 26.7 (0.10); Zn 17.4 (0.46) and Cu 45.8 (0.40) which are found to be in good agreement with the certified values for Pb 25.0 (1.5); Zn 16.0 (0.7) and Cu 46.6 (1.8). The average traffic volumes of the study area are 990 vehicles per hour and 520 vehicles per hour for high and low traffic density areas, respectively.
  A.O. Ogunfowokan , E.K. Okoh , A.A. Adenuga and O.I. Asubiojo
  The treatment performance of the sewage treatment oxidation pond of a Nigerian University was assessed in terms of pH, electrical conductivity, biochemical oxygen demand (BOD5) and nutrient removal from the influent. These parameters were simultaneously monitored in the receiving stream, influent and effluents. Significant pollution of the receiving stream was indicated for BOD5, nitrate, phosphate, suspended solids and pH. The levels of these parameters in the sewage effluent exceeded the Nigerian Federal Environmental Protection Agency tolerance limits for the effluents to be discharged through public sewers into a stream. In addition, the levels of some trace metals: Pb, Fe, Mn, Zn and Cd were also determined in the influent, effluent of the oxidation pond and the receiving stream. High mean levels of Pb, Zn and Fe were observed in the receiving stream and exceeded the WHO guideline levels for drinking water and for protection of aquatic ecosystem. This unfortunately, may affect the `health` of the aquatic ecosystem in the receiving stream and the health of the rural dwellers who use the stream water directly for domestic purposes without treatment.
  A.O. Ogunfowokan , M.K. Morakinyo , O.S. Agboola and L.M. Durosinmi
  Twenty and eighteen different brands of biscuit and sweet wrappers respectively from Nigeria were analysed for the first time for their levels of lead and cadmium in this study. Present results show that concentrations of lead were generally higher compared with cadmium for both sweet and biscuit wrappers. The mean concentrations of lead and cadmium in sweet wrappers varied between 1520.0 ± 0.11 and 2.40 ± 0.01 μg g-1 and between 1.64 ± 0.02 and 0.36 ± 0.01 μg g-1, respectively. The levels of lead and cadmium in biscuit wrappers ranged from 8294.0 ± 0.36 to 14.4?0.01 μg g-1 and from 2.04 ± 0.01 to 0.24 ± 0.01 μg g-1, respectively. There are no guidelines for the levels of lead and cadmium in food wrappers; however the levels reported in this research are quite high and may give cause for concern.
 
 
 
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