Polycyclic aromatic hydrocarbons (PAHs) are a kind of persistent organic pollutants (POPs) which
distributed widely in the environment, and had carcinogenic, teratogenic and mutagenic effects on
mammalian and human. Some PAHs can react with NO2, HNO3, O3, producing nitro-PAHs and
oxidised PAHs of direct mutagenicity. Nitro-PAHs are not only mutagenic, some of which are also
carcinogenic. On the 129 "priority pollutants" blacklist which were proposed in 1976 by the U.S. EPA, 16
kinds of them are polycyclic aromatic compounds. PAHs properties of poor water solubility and high
octanol - water partition coefficient (Kow) made them easily assigned to living body, soil and sediments.
The behaviors of their environmental chemistry are volatilization, photodegradation; absorption, Aging
and fixation process in the soil - water medium; and the interaction between plants and microorganisms.
The migration path of PAHs in the soil is: pollution source — topsoil — plow bottom layers of the soil —
the soil vadose zone underground — underground aquifers [1]. The harm to the human body caused by
PAHs into the soil is higher than that of into air and water