Distribution characteristics and potential ecological risk assessment of heavy metals in river water in Shanghai, China

Authors: Yongsheng Zeng*, East China Normal University, Chunjuan Bi, East China Normal University
Topics: Environmental Science, China
Keywords: Shanghai, River network, Heavy metals, Distribution, Ecological risk
Session Type: Paper
Day: 4/5/2019
Start / End Time: 8:00 AM / 9:40 AM
Room: Hoover, Marriott, Mezzanine Level
Presentation File: No File Uploaded

The heavy metal (HM) concentrations and distribution in the water of the urbanized river network are closely related to urban land use, industrial activities, and population density. River in Shanghai as the research object, this study selected the including Industrial areas, Agricultural areas, Inner-city, Suburban towns, and Island areas, 53 samples. The concentrations levels, spatial distribution characteristics, influencing factors, main sources and potential ecological risk levels of six HMs such as Cd, Cr, Cu, Hg, Pb and Zn in the surface water and sediments of the river network were analyzed. The concentration of Cd, Cr, Cu, Pb and Zn in the surface water of the Shanghai river network is relatively low, and Hg pollution exists in some rivers. While the concentration of HMs in the sediments are generally higher than that of rivers in China and abroad. The concentrations of HMs in the surface water and sediments of the river network in the Inner-city is generally higher than in other areas. Acid volatile sulfides (AVS), total organic carbon (TOC) and clay in river sediments affect the migration and transformation of HMs such as Cd, Pb, and Zn. HMs in the Shanghai river network primarily come from industrial activities, traffic emissions, and coal-burning emissions. HMs in the Shanghai river network sediments have high ecological risk; Hg and Cd were the main contribution elements of potential ecological risk, Inner city and Suburban towns have the highest potential ecological risk index, with heavy ecological risk and high ecological risk, respectively.

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