keywords: Concentration, contamination, lead, leaves, soil, traffic
This study was designed to evaluate the levels of lead and the spatial distribution of the pollution caused by automobile exhaust emission associated with volume of traffic density in Lagos Metropolis. Lead concentration in soil and leafy plant samples was determined using Atomic Absorption Spectrophotometer. The mean lead concentration in soil samples obtained from high traffic area, medium traffic area and low traffic area ranged from 0.124 to 0.188 mg/g, 0.177 to 0.487 mg/g and 0.058 to 0.158 mg/g, respectively. There is a marked discrepancy in the capacity of the three soil depth profiles to retain lead and hence a steady depth wise decrease in the concentration of lead across the depth profile from topmost soil samples (0-10 cm) to innermost soil samples (20 -30 cm). Lead concentration in the leave samples varied greatly from sampling points but ranged from 0.003 to 1.09 mg/g. Lead concentration in the dry leaves were higher than in fresh leaves. The concentration of lead in the leafy plant samples from the outskirt of Lagos city were lower compared to those from other sampling point indicating that vehicular emission was the main source of lead pollution.
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