SYNOPSIS Polycyclic Aromatic Hydrocarbons (PAHs) in Soil — a Review

摘要: PAHs are mainly produced by combustion processes and consist of a number toxic compounds. While the concentrations individual in soil natural (e.g., vegetation fires, volcanic exhalations) estimated to be around 1—10 μg kg−1, recently measured lowest frequently 10 times higher. Organic horizons forest soils urban may even reach PAH several 100 kg−1. The mixture temperate is often dominated benzofluoranthenes, chrysene, fluoranthene. few existing studies on tropical indicate that relatively lower than for most compounds except naphthalene, phenanthrene, perylene suggesting presence unidentified sources. accumulate C-rich topsoils, stemfoot area, at aggregate surfaces, fine-textured particle fractions, particularly silt fraction. associated with organic matter (SOM) soot-like C. Although water-solubility low, they encountered subsoil transported association dissolved (DOM). uptake plants small. Most detected plant tissue from atmospheric deposition. However, earthworms bioaccumulate considerable amounts short periods. reviewed work illustrates there paucity data global distribution PAHs, respect southern hemispheric regions. Reliable methods characterize bioavailable pools still need developed.