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Articles by E.A. Oluyemi
Total Records ( 2 ) for E.A. Oluyemi
  V.F. Olaleye , E.A. Oluyemi and O.A. Akinyemiju
  Disamenities caused by emissions from Ewekoro cement Kilns were monitored at some terrestrial and aquatic receptor locations. High levels of total suspended particulates (TSP) and atmospheric deposition rates (ADR) were recorded within the factory compared to auxiliary locations outside the factory. The TSP and ADR levels which are location dependent were significantly higher (p<0.05) during the dry periods than in the wet season. Irrespective of seasonal variations the key elements in the emissions were Ca2+ and Fe2+. The concentrations of Zn2+, Mn2+ and Pb+ which were trace elements were significantly higher (p<0.05) in the deposited than in the airborne particulates. An extensive vegetation structure overlap was recorded at the various sites studied. The most abundant flora belongs to the family: Poaceae with nine (9) identified species. Also, prominent at the study sites with four (4) species each was the family: Cyperaceae and Asteraceae. The planktonic flora and fauna of the river systems draining the area were poor with 16 phytoplanktonic and 9 zooplanktonic species. Numerically, the phytoplanktons were dominated by diatoms (Bacillariophyta) with Synedra sp. being the most abundant species. The zooplanktonic fauna dominated by rotifers had Lecane curvicornis as a regular occurrence in all the three catchment rivers. The physico-chemical parameters assayed were significantly higher (p<0.05) in the factory effluent discharges than in water samples from each of the catchment rivers. Seasonal variations inclusive, HCO3-, CO32-, Ca2+ and Mg2+ constituted the ionic component of water samples analysed irrespective of location. Alaguntan river which receives effluents directly from the factory had significantly higher levels (p<0.05) of the assayed ions than the other two rivers draining the cement factory catchment area.
  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.
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