Distribution characteristics and ecological risk assessment of heavy metals in surface sediments of Guchenghu Lake and its retreating and returning lake area
JIA Bing-chan1,2, ZHANG Ming3, WU Juan3, GU Xiao-hong1, YUAN He-zhong2, ZI Xin-yuan1, LI Yi-fan1, ZENG Qing-fei1
1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; 2. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China; 3. Gaochun District Water Authority Bureau, Nanjing 211300, China
Abstract：In order to explore the impact of returning from the polder to the lake on the pollution characteristics, spatial distribution and ecological risks of heavy metals in the surface sediments of Guchenghu Lake, the heavy metals (Fe, Mn, As, Zn, Cr, Co, Ni, Cu, Cd and Pb) contents were compared and analyzed, using the geo-accumulation index method and the potential ecological risk index method to evaluate the status of heavy metal pollution in sediments and the degree of potential ecological risk, using correlation and cluster analysis to analyze the potential sources of major heavy metal pollutants. The mean values of Cd (0.21mg/kg) in sediments of polders and Cd (0.56mg/kg), Zn (145.33mg/kg) and Pb (41.17mg/kg) in sediments of lakes were 2.45, 6.55, 2.24 and 1.87 times the background value of Jiangsu Province soil, respectively. The contents of heavy metals Cd, Zn, Cu and Pb in the surface sediments of the lake area were significantly higher than those of the retreating polder area. The evaluation by geoaccumulation index method showed that Cd in the retreat area was slightly polluted; Cd in the lake area was moderately polluted, and Zn, As, Cu, Pb were mildly polluted. The potential ecological risk index showed that the ecological risk of surface sediments in the lake area was higher than that in the retreat area; Cd was the most important contributor to ecological risk in the lake area and the retreat area, which may come from aquaculture activities and industrial wastewater discharge. The return polder land to Guchenghu lake plays a positive role in reducing the ecological risk of heavy metals in Guchenghu Lake.
贾冰婵, 张鸣, 武娟, 谷孝鸿, 袁和忠, 訾鑫源, 李一凡, 曾庆飞. 固城湖退圩还湖区沉积物重金属特征及生态风险评价[J]. 中国环境科学, 2022, 42(10): 4741-4751.
JIA Bing-chan, ZHANG Ming, WU Juan, GU Xiao-hong, YUAN He-zhong, ZI Xin-yuan, LI Yi-fan, ZENG Qing-fei. Distribution characteristics and ecological risk assessment of heavy metals in surface sediments of Guchenghu Lake and its retreating and returning lake area. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(10): 4741-4751.
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