Residual Characteristics of Pollutants in Topsoil of a Former Organochlorine Pesticide Manufacturing Enterprise

Organochlorine pesticides(HCH and DDT) in the topsoils of a former pesticide site in Beijing were quantitatively analyzed in order to understand the soil pollution situation of the former organochlorine pesticide manufacturing enterprise.The results showed that the concentrations of HCHs in the soils were in the range from 1 mg·kg-1 to 440 mg·kg-1,the contents of DDTs in the site ranging from 5 mg·kg-1 to 966 mg·kg-1.The contents of β-HCH among HCH isomers and of DDD among DDT isomers and metabolites were relatively higher through the analysis of the pollutants compositions.The results demonstrated that the soil pollution in the site was still very severe although the production of these pesticides had been prohibited for more than 20 years since 1981.The most serious soil pollution occurred in the manufacturing area located in the middle of the site and the storage sites in the south area through the contour lines drawn by Kriging interpolation method.The contents of the pollutants were higher than the intervention values of the soil remediation.