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Mate analysis of heavy metal pollution in sediments of Chaohu Lake, Dongting Lake and Poyang Lake |
LI He, WANG Shu-hang, CHE Fei-fei, JIANG Xia, NIU Yong |
National Engineering Laboratory for Lake Pollution Control and Eeological Restoration, State Environment Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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Abstract The study analyzed the heavy metal concentrations of Chaohu Lake,Dongting Lake and Poyang Lake sediment from 2004 to 2021, and conduct the Monte Carlo uncertainty analysis of geoaccumulation, potential ecological risk and toxicity heavy metal of the three lakes to objectively and comprehensively describe the contamination degree. The results showed that,the three lakes were polluted by Cu, Zn, Pb, Ni, Cr and Cd in different degrees and followed with the order: Poyang Lake > Dongting Lake > Chaohu Lake. The geoaccumulation indices showed that Cd is the dominant pollutant in all three lakes, and the probabilities were 84.76% for moderatesediment contamination, in Chaohu Lake, 32.64% for heavy sediment contamination in Dongting Lake and 46.64% for heavy sediment contamination in Poyang Lake respectively. Cd contribute most to the potential ecological risks index (RI), and its proportion in the Chaohu lake, Dongting lake and Poyang lake were 80.26%、91.04% and 90.03%, respectively. Chaohu lake were at low-moderate risk, Dongting lake take the 60.74% possibility of high risk and Poyang lake take 68.95% possibility of high risk. Toxicity unit evaluation results indicated that Pb and Cr were the main contributor of toxicity in three Lakes sediment. The toxicity of heavy metals was observed the low level in the Chaohu lake and Dongting lake, but the moderate leve in Poyang lake with a 69.03% cumulative probability. The heavy metals of surface sediments in Chaohu lake, Dongting lake and Poyang Lake mainly derived from industry, transportation, agriculture and natural sources. The heavy metal contaminatio of Chaohu Lake mainly came from transportation, while Dongting lake and Poyang Lake mainly came from industry.
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Received: 27 June 2022
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