Heavy metal regional characteristics and potential ecological risk assessment of lakes and reservoirs in North China
LI Jie1,2,3, SONG Peng2, LI Hui1,2, CHENG Yun-xuan1, JIAO Li-xin1,3, LI Guo-dong1
1. National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
2. College of Agriculture, Henan University of Science and Technology, Luoyang 471000, China;
3. State Environmental Protection Key Laboratory for Lake Pollution Control, State Environmental Protection Key Laboratory of Drinking Water Source Protection, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
The sediments of Baiyangdian Lake, Hengshui Lake, Yuqiao Reservoir, Songhua Lake, Dahuofang Reservoir and Xiaoxingkai Lake were selected as research objects. The contents of heavy metal elements including Cu, Zn, Pb, Cr and Ni in the sediments of the six lakes and reservoirs were determined with descriptive statistical analysis combined with multi-factor comparison of heavy metal pollution in other waters at home and abroad. The significant differences between the major sources of heavy metal pollution in the six lakes and reservoirs, the accumulation of heavy metals in the sediments and the similarities and differences with other waters at home and abroad were discussed. Heavy metal pollution in the sediments of Baiyangdian Lake, Hengshui Lake, Yuqiao Reservoir, Songhua Lake, Dahuofang Reservoir and Xiaoxingkai Lake was at a moderate to low level. There were differences in the main pollution sources between the six lakes. The heavy metal content of the sediment did not show a clear upward trend. Sediment heavy metal (Zn, Pb) are enriched in the six lakes, But the Pb content decreased compared with historical data, and the zinc content is generally higher than other regions. Dahuofang Reservoir sediments had the most heavy metal pollution. The average values of Cu, Zn, Pb, Cr and Ni were 56.28mg/kg, 142.3mg/kg, 17.44mg/kg, 97.9mg/kg, 44.44mg/kg respectively. Xiaoxingkai Lake has the lowest heavy metal content. The average values of Cu, Zn, Pb, Cr and Ni are 2.41mg/kg, 63.90mg/kg, 13.37mg/kg, 56.36mg/kg, 26.09mg/kg respectively. Comprehensive risk assessment of the six lakes and reservoirs, Dahuofang Reservoir> Yuqiao Reservoir> Baiyangdian Lake> Hengshui Lake> Songhua Lake> Xiaoxingkai Lake. The overall potential ecological risk index of heavy metals is low.
李捷, 宋鹏, 李慧, 程云轩, 焦立新, 李国栋. 北方湖库沉积物重金属区域特征及生态风险评价[J]. 中国环境科学, 2020, 40(11): 4927-4935.
LI Jie, SONG Peng, LI Hui, CHENG Yun-xuan, JIAO Li-xin, LI Guo-dong. Heavy metal regional characteristics and potential ecological risk assessment of lakes and reservoirs in North China. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(11): 4927-4935.
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