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| Distribution and Ecological Risk Assessment of Heavy Metals in Agricultural Soils Surrounding a Contingency Water Source, Beijing |
| Received:March 10, 2015 |
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| KeyWord:gold mine;soil heavy metal;sources;potential ecological risk |
| Author Name | Affiliation | E-mail | | TANG Lei | Civil & Environment Engineering School, University of Science & Technology Beijing, Beijing 100083, China
Beijing Geo-engineering Design & Research Institute, Beijing 101500, China | | | ZHANG Hui-chang | Beijing Municipal Bureau of Land and Resources | | | JI Hong-bing | Civil & Environment Engineering School, University of Science & Technology Beijing, Beijing 100083, China
State Key Laboratory of Environment Geochemistry, Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002, China | jih_0000@126.com | | FENG Jin-guo | Beijing Geo-engineering Design & Research Institute, Beijing 101500, China | | | YAO Jun | Civil & Environment Engineering School, University of Science & Technology Beijing, Beijing 100083, China | | | YAN Guang-xin | Beijing Geo-engineering Design & Research Institute, Beijing 101500, China | |
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| Abstract: |
| Heavy metals in soils surrounding water source area pose direct risks to the water safety. Here the spatial distribution and sources of heavy metals in agricultural soils around a contingency water source of Pinggu, Beijing, were elucidated by ArcGIS and multivariate analysis. The ecological risk assessment of soil heavy metals was also performed using potential ecological risk index(RI). The mean concentrations of heavy metals in soils were in order of [Mn] >[Pb] >[Cr] >[As] >[Hg] >[Cd], all exceeding the soil background values of Beijing. The soils were seriously polluted by Pb, Cd and As, with the mean concentrations of 96.78, 0.25 and 28.40 mg·kg-1, respectively. These metals mainly came from the human activities via mineral exploitation and transportation. The concentrations of Mn, Cr and Hg were slightly higher than the soil background values. Manganese and Cr were derived from the natural sources by weathering of rock and soil parent materials, and Hg from both human activities and natural sources. The potential ecological risk factor(Eri) for heavy metals decreased in order of [Cd] >[Hg] >[As] >[Pb] >[Cr] >[Mn]. The total potential ecological risk index of heavy metals in soils was 169.29, belonging to moderate potential ecological risk. There was higher potential ecological risk in the southeast than in the northwest areas. These results indicate that soils around the contingency water source of Pinggu, Beijing, is threatened deeply by heavy metals and that more attention should be paid to the potential ecological risk assessment. |
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