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Chronological deposition record of trace metals in sediment cores from Chaohu Lake, Anhui Province, China

文献类型： 外文期刊

作者： Wang, Xin 1 ; Gao, Na 2 ; Liang, Yangyang 2 ; Liu, Fei 1 ; Hong, Xiuping 1 ; Zhou, Xiujie 1 ; Sun, Liqiang 1 ; Li, Hui 3 ; Fang, Ting 2 ;

作者机构： 1.Huaibei Normal Univ, Coll Life Sci, Huaibei 235000, Peoples R China

2.Anhui Acad Agr Sci, Fisheries Res Inst, Hefei 230000, Peoples R China

3.Anhui Agr Univ, Sch Resources & Environm, Hefei 230000, Peoples R China

关键词： Sediment cores; Trace metals; Cs-137 and Pb-210 dating; Enrichment assessment; Human perturbation

期刊名称：ENVIRONMENTAL MONITORING AND ASSESSMENT （ 影响因子：3.307； 五年影响因子：3.42 ）

ISSN： 0167-6369

年卷期： 2022 年 194 卷 11 期

页码：

收录情况： SCI

摘要： Lakes located in the mid-low reaches of the Yangtze River watershed have been subjected to various degrees of human perturbation that would have resulted in toxic metal concentrations and would pose potential risk to the natural habitats. Therefore, in the present study, two sediment cores from Chaohu Lake were collected to determine any such concentration, expressed as the enrichment characteristics of major and trace metals (Al, Fe, Mn, Cu, Pb, Zn, Cr, Cd, As, Hg, and Ni) in response to natural and anthropogenic changes. An approximate 180-year (1840-2021) deposition record of trace metals in sediment cores was obtained on the basis of Cs-137 and Pb-210 dating. Enrichment factors (EFs) and the geo-accumulation index (I-geo) were adopted to evaluate the enrichment state and pollution status of trace metals. The results showed that Cu and Zn were persistently more enriched in sediment, whereas Mn, Pb, Cd, and Hg has shown remarkable increasing trends in the west lake since the 1970s. Evaluation of the I-geo confirmed that sediment was moderately polluted with Cu and Zn within the whole lake and with Cd in the west lake area, whereas it was uncontaminated with Cr and slightly contaminated with other metals. Furthermore, source identification based on multivariate statistical analysis including correlation analysis, principal component analysis, and cluster analysis suggested similar pollution sources for the studied metals. Combined with the natural and anthropogenic changes within the watershed, enhanced soil erosion due to population expansion and agricultural intensification was a major contributor to sedimentary metals before the 1970s while industrial wastewater, urban runoff, and domestic sewage were predominant inputs of trace metals after the 1970s.

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