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Polycyclic Aromatic hydrocarbons (PAHs) are large groups of organic compounds with two or more fused aromatic rings containing carbon and hydrogen only. They are by-products of combustion and are present in industrial chemical wastes, biogenesis and volcanic eruptions. The U.S. Environmental Protection Agency considered them as priority pollutants. The concern of this study is to investigate the depth-wise distribution of top (0-15cm) and sub (16-30cm) soil of 16 PAHs in 16 urban and 8 control samples in WesternDelta Nigeria. After extraction and purification, quantification of PAHs was done using GC-FID. Reagents used are of chromatographic grade. The total concentration of 16 PAHs varied between 1.14 and 652.81μg.g -1 dry weight. Cluster analysis showed the existence of 6 cluster groups with sample points B62, C19, A21, A51 and A41 as entropy members. Pearson Correlation matrix indicates positive and high correlation between sample points at  = 0.01 and r = > 0.70 for most sample pairs. Dept‒wise distribution of PAHs showed the existence of relatively low percentage concentration of PAHs in top soil (0.18 B[g]p ‒ 40.43 Phe) over sub soil (0.10 Acy ‒ 45.15 Phe). Percentage distribution of ring PAHs showed higher concentration of HPAHs over LPAHs in sample site A and B than the control site (C). Source identification revealed a dominance of pyrolytic over petrogenic PAHs. Descriptive statistics showed that the obtained concentration of PAHs in most sample points has log-normal distribution and are consistent with results reported from other soil matrix. The obtained PAHs values in this study could help to set a baseline concentration benchmark and evaluation of exposure risk to organisms in the rapidly urbanizing area.

Quantification and Distribution Characteristics of Polycylic Aromatic Hydrocarbons in Soil Profiles of Western Delta, Nigeria.