Journal of East China Normal University(Natural Science) ›› 2021, Vol. 2021 ›› Issue (2): 54-62.doi: 10.3969/j.issn.1000-5641.2021.02.006

• Estuary and Coastal Research • Previous Articles     Next Articles

Content and ecological risk assessment of heavy metals in the surface sediments of Qingcaosha Reservoir in Shanghai

Yiping ZHU1(), Xiaofei LI2, Xia LIANG3,*()   

  1. 1. Shanghai Chengtou Raw Water Limited Company, Shanghai 200125, China
    2. School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China
    3. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
  • Received:2020-03-16 Online:2021-03-25 Published:2021-04-01
  • Contact: Xia LIANG;


Surface sediments were collected from five representative areas—the floodgate entrance, the north and south sides of the reclamation area, and the central and downstream sections—of Qingcaosha Reservoir; the pollution characteristics and potential ecological risk of seven heavy metals (Cu, Zn, Pb, Cr, Cd, As and Hg) in these sediments were subsequently investigated. Results showed that the heavy metal content in the surface sediments showed spatial variations: the content was relatively higher in the center of the reservoir and was low in the north and south sides of the reclamation area. Heavy metals in the surface sediments, in addition, were mainly in the residual fraction; the content of heavy metals in the exchangeable fraction was extremely low. A potential ecological risk assessment indicated that the comprehensive potential ecological risk index (ERI) of the investigated heavy metals ranged from 55 to 113. The maximum ERI value was observed around the floodgate of the reservoir entrance, and low ERI values were observed at the north and south sides of the reclamation area. The ERI was lower than the threshold for low ecological risk, indicating that heavy metals in the surface sediments of the Qingcaosha Reservoir have low potential ecological risk.

Key words: heavy metal, sediment, ecological risk, reservoir, drinking water source

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