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Assessment of heavy metals and POPs contamination in a sewage irrigation area

SUN Libo 1; GUO Guanlin2,3; ZHOU Qixing 2;LIU Rui 1,4;ZHANG Lanying1   

  1. 1College of Environment and Resource,Jilin University,Changchun 130026,China;2Key Laboratory of Terrestrial Ecological Process,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016, China;3Graduate School of Chinese Academy of Sciences,Beijing 110039, China; 4Liaoning Province Centre of Analysis and Testing Research,Shenyang 110015，China
  • Received:2005-03-08 Revised:2005-09-15 Online:2006-01-12 Published:2006-01-12

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Abstract: Through soil profile sampling and with different evaluation methods,this paper assessed the contamination trend of heavy metals and POPs in a wastewaterirrigated area.The results showed that the concentrations of heavy metals Cr,As,Hg,Cd,Cu,Pb,Ni and Zn and of POPs,BHC and DDT in soil had an increasing trend. 80% or more topsoils had a higher contaminants concentration than subsoils,and the contaminants concentration in 85% or more soil samples was surpassed their background value.The two POPs and heavy metals Cr,As,Hg,Cd and Cu could accumulate in soil,and continuous wastewater irrigation could make the accumulated contaminants migrate into groundwater and food chain,resulting in the hazard to environmental health.

Key words: Cutting, Forage grass, Eco-physiological characteristics, Root system, Biomass