Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 416, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125818
Keywords
Sediment; Cd; Metal diffusion; Risk assessment; Soil erosion
Categories
Funding
- National Natural Science Foundation of China, China [41807494, 31500423]
- Major Science and Technology Program for Water Pollution Control and Treatment of China, China [2018ZX07208005]
- National Fundamental Research Project for Science and Technology of China, China [2014FY11040001]
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This study investigated the accumulation, risk, distribution, and sources of heavy metals in 62 lakes along the Yangtze River. It found that most lakes were contaminated with Cd, with higher ecological risk in the middle reach and southern bank of the Yangtze River. The study also revealed that Cr originated from the natural environment, while Zn, Cu, Pb, Cd and As were affected by human activities.
Metal pollution poses a significant threat to ecological security and human health. Current research on the causes, sources and distribution of metal pollution in the Yangtze River plain is lacking. This study investigated the accumulation, risk, distribution, and sources of heavy metals in 62 lakes along the Yangtze River, and analyzed the relationship between river-lake connectivity, economic structure, population and metal diffusion. The mean concentrations of Cr, Cu, Hg, Zn, Cd, Pb and As in the surface sediments of these lakes were 90.8, 60.1, 0.06, 102, 0.89, 42.7, and 6.01 mg/kg, respectively. Most (99%) of the lake sediments were contaminated with Cd, and the lakes in the middle reach and southern bank of the Yangtze River had a higher ecological risk. Cr originated from the natural environment, whereas Zn, Cu, Pb, Cd and As were affected by human activities. The lakes disconnected from the Yangtze River had higher concentrations of Cu, Zn, Pb and As, while the lakes connected to the river had higher concentrations of Cd and Cr. This comprehensive analysis determined the pollution characteristics of heavy metals, illustrated the causes of non-point pollution in the Yangtze River plain, and showed that soil-water erosion is important in metal diffusion.
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