抚仙湖沉积物重金属累积特征与风险评价

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Abstract Combining with the ²¹⁰Pb and ¹³⁷Cs dating results of typical core FX12, this study investigated the spatial and temporal variations of heavy metal concentrations and pollution in sediments from different areas of Fuxian Lake by analyzing the heavy metal concentration, grain size, and magnetic susceptibility of 9 short sediment cores. The results showed that the grain size compositions of sediments in Fuxian Lake were mainly composed of clay (<4μm) and fine silt (4~16μm). The heavy metal concentrations exhibited certain spatial variations, with higher concentrations of Zn, Pb, and Cd in the northern and southern lake areas and higher concentrations of Hg, Cu, and As in the southern lake area. Generally, heavy metal concentrations were higher in core FX4 than in others, which were related to the higher clay content and pollution. The vertical variation trends of metal concentrations were similar in the sediment cores from different lake areas. Before 1950, concentrations of metals were relatively stable. Since 1950, concentrations of Al, Cr, Ni and Cu gradually decreased, while concentrations of As, Hg, Zn, Pb and Cd have shown varying degrees of increase. Based on the results of enrichment factors, As, Cd, Pb, and Zn were identified as the main pollutants, and the pollution began at around 1980 and gradually increased. Among the pollutants, Cd reached a strong pollution level in the near-surface sediment. The accumulative amount of anthropogenic As, Cd, Hg, Pb, and Zn showed spatial differences in the sediment cores, with relatively higher values for As in the central and southern lake areas. Due to anthropogenic pollution inputs, the ecological risk of heavy metals in sediment cores increased from low to medium, with Hg and Cd posing a medium to high ecological risk in near-surface sediments and the other metals posing low ecological risks.

Key words： sediment heavy metals spatio-temporal variations pollution and ecological risk Fuxian Lake

Received: 28 November 2022

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X54

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	BAI Guang-yi
	ZHAO Ke-liang
	LIU En-feng
	ZHANG En-lou

Cite this article:

BAI Guang-yi,ZHAO Ke-liang,LIU En-feng等. Accumulation characteristics and risk assessment of heavy metals in sediments of Fuxian Lake[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3625-3633.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3625

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