[The disappearance and transfer behavior of PCBs bestrewed into semi-field soil systems].

The disappearance and transfer behavior of polychlorinated biphenyl (PCBs) (the mains of penta-PCBs) at higher concentrations (400 mg/kg) bestrewed into semi-field soil systems were studied under near field conditions (semidry climate in North China). The result showed that PCBs did not lose and transfer forward below after 12 months of treatment. And after 24 months of treatment, only less than 2% of PCBs transferred vertically no more than 10 cm and PCBs concentration at treatment layers decreased 10.