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| Vertical distribution characteristics and risk assessment of heavy metals in core sediments from Kaifeng suburban rivers |
| Received:November 30, 2016 |
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| KeyWord:Kaifeng suburb;sediment profile;heavy metals speciation;risk assessment;resource utilization |
| Author Name | Affiliation | | ZHANG Jun-hua | School of Environment and Planning, Collaborative Innovation Center on Yellow River Civilization of Henan Province, Kaifeng 475004, China
Institute of Nature Resources and Environmental Science Research, Kaifeng 475004, China | | LU Cui-ling | School of Environment and Planning, Collaborative Innovation Center on Yellow River Civilization of Henan Province, Kaifeng 475004, China
Institute of Nature Resources and Environmental Science Research, Kaifeng 475004, China | | LIU Yu-han | School of Environment and Planning, Collaborative Innovation Center on Yellow River Civilization of Henan Province, Kaifeng 475004, China
Institute of Nature Resources and Environmental Science Research, Kaifeng 475004, China | | WANG Hong-tao | School of Environment and Planning, Collaborative Innovation Center on Yellow River Civilization of Henan Province, Kaifeng 475004, China
Institute of Nature Resources and Environmental Science Research, Kaifeng 475004, China |
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| Abstract: |
| To understand the migration characteristics and ecological risk problems of heavy metals in sediments of Kaifeng suburban rivers, vertical sediments from three rivers were collected and analyzed for total concentrations and speciation of heavy metals by using the sequential extraction procedure, and risks from exposure to heavy metals in sediments were evaluated using the risk assessment code method. The results indicated that the mean contents of Cd, Cu, Zn, and Pb were higher than the China Stream Sediment Background Values. There were significant differences in vertical distributions of total concentrations and different species concentrations of heavy metals in the sediment cores from six sampling sites, however there was no distribution regularity. Sediment profiles from the lower section of each river showed significantly higher total concentrations of Cd, Cr, Cu, Ni, Zn, and Pb than those from the upper sectin. Cd and Zn existed mainly in the exchangeable fraction and residual fraction, whereas Cr, Ni, Cu, and Pb existed mainly in the residual fraction. Based on the results from the RAC method, the risks from exposure to heavy metals in the surface sediments were in the following order:Cd> Zn >Cu >Ni >Cr >Pb. In the vertical sediments, Cd mainly posed high to extremely high risk to the environment, Zn a medium to high risk, Cu and Ni a slight to medium risk, and Cr and Pb slight risk. |
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