Polyaromatic hydrocarbons (PAHs) are resistant to microbial
degradation because of their low water solubility and complex
structure with two or more fused benzene rings (Antizar-Ladislao
et al., 2004). Since many PAHs are toxic and carcinogenic, their
accumulation in the environment is of great concern. A typical
source of PAH contamination in soil is coal-tar creosote, which was
commonly used to preserve and waterproof crossties and power
line poles. Particularly in Finland, former sawmill sites constitute a
major problem. In addition to PAHs, such soils may contain
chlorophenols, polychlorinated dibenzo-p-dioxins and -furans
(PCDD/F), and heavy metals (Kitunen et al., 1987)
Polyaromatic hydrocarbons (PAHs) are resistant to microbialdegradation because of their low water solubility and complexstructure with two or more fused benzene rings (Antizar-Ladislaoet al., 2004). Since many PAHs are toxic and carcinogenic, theiraccumulation in the environment is of great concern. A typicalsource of PAH contamination in soil is coal-tar creosote, which wascommonly used to preserve and waterproof crossties and powerline poles. Particularly in Finland, former sawmill sites constitute amajor problem. In addition to PAHs, such soils may containchlorophenols, polychlorinated dibenzo-p-dioxins and -furans(PCDD/F), and heavy metals (Kitunen et al., 1987)
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