Abstract: In order to understand the environment distribution of polychlorinated biphenyls (PCBs) in soil, Chinese gridded industrial pollutants emission and residue model (ChnGIPERM) was developed based on ChnGPERM (Chinese gridded pesticide emission and residue model), which has been used to study environmental behavior of PCBs in soil. Characteristics of PCBs in different types of soil, including urban soil, dry soil, paddy, grass, forest and uncultivated soil, contaminated by emissions of a single PCB source were investigated. The results showed that, the residue concentration of PCBs in soil depends on contents of air and water in soil, as well as the physicchemical properties of PCBs, the correlation between quality fractions and contents of water in soil was pretty high (R=-0.999 5，P<0.000 1). With the increasing soil depth, the residue concentrations decrease with higher chlorine content in PCBs. Because of the higher water solubility, PCBs that contains less chlorine enters soil more easily, and their vertical distributions in soil change fast with time, while PCBs containing more chlorine have weaker abilities to diffuse in soil, and their vertical distributions in soil are quite stable with time.

Key words: polychlorinated biphenyls, numerical methods, soil types, residue concentration, vertical distribution of soil