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Geoscience ›› 2017, Vol. 31 ›› Issue (03): 545-554.

• Geochemistry • Previous Articles     Next Articles

Geochemistry and Risk Assessment of DDTs and HCHs in Soil from a Renewal Area in the Tongzhou District of Beijing

AN Yonglong(), HUANG Yong, SUN Zhao, DENG Kaiwen, LI Di, HUANG Dan   

  1. Beijing Institute of Geo-exploration Technology,Beijing 102218,China
  • Received:2016-11-18 Revised:2017-01-20 Online:2017-06-10 Published:2017-06-27

Abstract:

A case study has been completed on the Tongzhou Universal Studios site. 15 surface soil samples in total have been collected for chemical analysis of DDTs and HCHs to reveal any spatial distribution pattern. In addition, some soil samples in two vertical profiles have been analyzed for the DDTs and HCHs concentrations and their distribution patterns. The DDTs and HCHs are detected in most of the surface soil samples, with contents of the ΣDDTs ranging from 4.94 μg·kg-1 to 196.15 μg·kg-1, and contents of the ΣHCHs from 0.82 μg·kg-1 to 10.21 μg·kg-1. In samples from the vertical profiles, the DDTs can only be partially detected and their concentrations are not obviously correlated to the variation of depth, while sudden change in confined depth exists; HCHs are detected in all the samples, and their overall concentration is negatively correlated to depth. Based on the national standard, an overall evaluation of soil environment in this region was conducted. The result shows that only a few samples in this area have DDTs concentration within the second-order standard, and the rest within the first-order standard, showing a low residual risk. The residual HCHs in soil are basically in accordance with the first-order standard. According to the concentration and distribution of the different isomers, we conclude a recent HCHs input in the region. Finally, the health risk assessment in the renewal area, indicates that the HCHs and DDTs have little effect on carcinogenic risk and some non-carcinogenic risks.

Key words: soil environment, organochlorine pesticides, geochemistry, risk evaluation, Tongzhou of Beijing

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