RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2009, Vol. 18 >> Issue (2): 192-.

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VERTICAL DISTRIBUTION OF POLYCYCLIC AROMATIC HYDROCARBONS IN SOILS OF REPRESENTATIVE SPOT IN MIANYANG CITY

XU Feng| QI Shihua| GAO Yuan| XING Xinli   

  1. Key Laboratory of Biogeology and Environmental Geology of Ministry of Education| China University of Geosciences| Wuhan 430074| China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-02-20

Abstract:

Through the selection of a representative of spot in Mianyang Economic Area，the vertical distribution of polycyclic aromatic hydrocarbons (PAHs) in soils was studied using GCMS.The results showed that in the entire soil column，surface soils with 5~20 cm depth have the highest concentration of PAHs.In addition，the soil below 40 cm，while the concentration of PAHs reduced very fast.As the surface layer (0~5 cm) have the frequent exchange between the soil and atmospheric，PAHs content were relatively low.The 5~20 cm depth soil was covered by surface soil，therefore the soil was enrichment PAHs fastest.Then the concentration of PAHs achieves the highest value in the whole soil column.The concentration of PAHs decreased with depth in the vertical profile.The highest concentration of PAHs was observed in the economic forest of Jiangyou City spot (33024 ng/g) followed by Santai County spot (29989 ng/g) and Youxian District spot (11274 ng/g).The principal PAHs compounds in study area were naphthalene，phenathrene and chrysene.The difference of soil and plant impact PAHs that were enrichment and transportation speed; therefore PAHs in different depths have changed.Compared with the corresponding environmental guideline values，the content of PAHs in Jiangyou City spot and Santai County spot were a bit high，and Youxian District spot was under the standard.

Key words: Mianyang City, PAHs, soils, vertical distribution

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