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| Assessment of Potential Ecological Risk of Heavy Metals in Soils from Jia-Pi-Gou Gold Mine Area, China |
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| KeyWord:gold mine area; soil; heavy metal pollution; assessment of potential risk |
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| Abstract: |
| The ecological risks of seven different soil heavy metals, including Hg, Cu, Zn, Pb, Cd, Cr and Ni, in the Jia-pi-gou gold mine area, which located in the upstream area of Songhua River were discussed using single and compound factor potential ecological risk index. The results showed that the concentration of soils were higher than the local reference values and the soils had serious ecological risks of Hg and Cd with the single ecological risk index of seven elements in sample points of gold mine area, the risk index being 464.6 and 140.8, respectively, and slight risks of Cu, Zn, Pb, Cr and Ni with the index were less than Hg and Cd. The risk order of heavy metals was Hg>Cd>Pb>Cu>Ni>Cr>Zn. Meanwhile, the average ecological risk index of soil heavy metals of the twenty-eight sample points was 637.6. Seven of them were more than 600, which indicated that the soil ecological risk of the area was serious, and eight of them were between 300 and 600, which indicated that the soil ecological risk of the area was less serious and other points were moderate or slight serious. Among seven metals, Hg contributed most to the regional ecological risk, and was the main risk factor of the ecological risk in the gold mine area. This phenomenon was related to the environment pollution owing to use of amalgamation process to extract gold for more than 190 years. |
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