Dynamics Analysis for Emission Sources of Polycyclic Aromatic Hydrocarbons in Tokushima Soils

Abstract

Soil samples from 30 sites in Tokushima, Japan, were analyzed to obtain contemporary normal (or typical) levels of polycyclic aromatic hydrocarbons (PAHs) in local soils. A very wide range of PAH concentration has been observed in these soils. The ΣPAH values ranged over 2orders of magnitude, from 1 to 147μg/kg. Fluoranthene was consistently found to be the most abundant compound. Other major constituents were pyrene, benzo[b]fluoranthene, and benzo[a]anthracene. Biomass burning and vehicular exhaust contribute PAH to soils. Higher PAH contents in rural soils principally came from biomass burning. Mobile sources (diesel-and gasoline-powered vehicles) raise PAH contents in urban soils. In addition, soil properties play some role in controlling/influencing the PAHs contents of soils.