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| Characteristics of spatial distribution andbiological toxicity for heavy metals in sediments of the Yangcheng Lake |
| GUO Xi-ya1,2, GAO Min1, ZHANG Jie1,2, ZHANG Hai-tao1,2, ZHU Jin-ge1, DENG Jian-cai1 |
1. State Key Laboratory of Lake and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Science, Nanjing 210008, China;
2. University of Chinese Academy of Science, Beijing 100049, China |
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Abstract To explore thespatial distribution and pollution characteristics of heavy metals in theYangcheng Lake, core sediment samples were analyzed. ICP-MS, ASFand Hydra-c automatic mercury measuring instrument were applied to quantify eight heavy metals (Cr, Ni, Cu, Zn, As, Cd, Pband Hg) in sediments samples from 15sampling sites of the Yangcheng lake in February 2018, analyzing the spatial distribution and pollution condition of heavy metals. The results indicated that the average contents of Cr, Ni, Cu, Zn, As, Cd,Pband Hg in the surface sediments were 101.28mg/kg, 68.72mg/kg, 6.54mg/kg, 87.33mg/kg, 5.85mg/kg, 0.45mg/kg, 34.02mg/kg and 0.09mg/kg, respectively, which were 1.34, 2.09, 2.89, 2.88, 1.69, 4.99, 1.54, 3.00times of the soil background values in Jiangsu Province.Contents of heavy metals showed a downward trend with increasing depth vertically. Cluster analysis and correlation analysis of eight metals manifested that except for As, Ni and Hg, there was a significant correlation between other heavy metals (P<0.05), which indicated certain homology among the heavy metals in sediments. The bio-toxicity effects of heavy metals in Yangcheng Lake sediments were evaluated by sediment quality guideline (SQG). The results suggested that Ni was more likely to have adverse effect on origanisms, with a probability of 75% and heavy metals like Cr, Cu, Zn, andAs were 10% to 75% likely to have biological toxic effects. Further analysis based on ERMQ evaluation showed the risk of adverse effects was higher in the west Yangcheng Lake compared to the other parts of the lake.
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Received: 14 July 2018
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