Abstract:By taking a chemical pollution site as the research object, this paper analyzed the characteristics of vertical and horizonal distribution of chlorobenzene and the effects of production history and hydrogeology on chlorobenzene’s distribution. The results showed that chlorobenzene could migrate vertically through clay layer and silty clay layer under the action of gravity and drip washing. The distribution of chlorobenzene in soil showed a significant enrichment characteristic that most chlorobenzene was concentrated in 12.0-15.6 m silty clay layer, among them the most seriously polluted layer was 14.4-15.6 m silty clay layer that the largest concentration of chlorobenzene reached to 1.0×104 mg/kg. The highest concentration of chlorobenzene was occurred at different soil depths among the sampling points. Several peak concentrations of chlorobenzene appeared at a sampling point, which was related to batching or intermittent leakage of chlorobenzene in productive process. Chlorobenzene mainly arose in silty clay layer of the chlorobenzene’s storage, use, disposition area and its adjacent silty clay layer, indicating that the horizontal distribution of chlorobenzene was mainly influenced by function division of company, and was also influenced by hydrogeololgy and generated a small range distribution.