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Journal of Applied Sciences
Year: 2004  |  Volume: 4  |  Issue: 3  |  Page No.: 380 - 383

Trace Lead, Zinc and Copper Levels in Barbula lambarenensis as a Monitor of Local Atmospheric Pollution in Ile-Ife, Nigeria

A.O. Ogunfowokan, O.I. Asubiojo, A.A. Adeniyi and E.A. Oluyemi    

Abstract: 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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