RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2004, Vol. 13 >> Issue (6): 584-588.

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CHARACTERISTICS OF CONTAMINATED SEDIMENTS IN WULI LAKE OF TAI LAKE

SHEN Yi-long,HE Pin-jing,SHAO Li-ming   

  • Received:2003-08-26 Revised:2003-11-07 Online:2004-11-20
  • Contact: HE Pin-jing

Abstract: Wuli Lake is one of the most seriously polluted areas of Tai Lake. For the remediation purpose, upper layer sediments, column sediments, interstitial water and lake water from 4 different locations in Wuli Lake were sampled, and the concentrations of heavy metals and nutrients in the samples were tested. The results indicated that heavy metals pollution level was slight compared with the Environmental Quality Standard for Soils（GB15618-1995）, when calculated with Igeo method. The heavy metals ranked in descending order of concentration was Cu>Cd>Pb>Hg>As>Cr. The concentrations of heavy metals in upper layer（0～5 cm） were lower than those in the second（5～10 cm） and third（10～20 cm） layer, which demonstrated as dominant contaminated deposit layers. The phenomenon was correspondent with the deposit characteristics of sediments. The concentrations of TN, TP and OM in upper sediments were high and an obvious correlation between these parameters could be found with the correlation coefficients were between 0.757 6 and 0.862 2. The concentrations of nutrients in sediments and interstitial water were much higher than those in water lake, which highlighted eutrophication as the most important endogenetic water pollution sources in Wuli Lake.

Key words: Tai Lake, Wuli Lake, contaminated sediments, pollution characteristics

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