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| Spatial migration and environmental effects of heavy metals in river sediments from in the Tongling mining area, Anhui province |
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Abstract The spatial distributions of five heavy metals and their migration characteristics in river sediments of Tongling mining area were discussed in this paper. Based on these results, the environmental influences of heavy metals on sediments were also expounded. The total concentrations and geochemical forms of five heavy metals (Cu, Pb, Zn, Cr and Cd) in sediments were determined in different sites along Xinqiao River and Shun’an River. These results showed that the concentrations of Cu, Zn, Pb, Cd were markedly higher than the background values of heavy metals of the lower Yangtze River sediment, especially for Cu and Cd. The lateral migration of heavy metals along rivers showed that these metals declined rapidly along Xinqiao River, but slowly along Shun’an River. The residual fraction was the dominant form for Cu, Zn, Pb, Cr in sediments from two rivers. Acid-extractable fraction was the dominant form for Cd in sediments. The risks of Cu, Zn and Cr were weakened during migration process, due to increasing residual fractions. But the active forms of Pb and Cd increased in the downstream, which will rise the ecological risk. Vertical changes of heavy metals in sediment cores showed that the concentrations and forms of heavy metals relied on the locations of sediment cores. The core sediment in Xinqiao river had the higher concentrations and more active forms of heavy metals, but smaller changes in the profile compared to the core sediment in Shun’an River. It reflected the faster accumulation rate and higher release risk for tailing-bearing sediment. The core sediment in Shun’an river showed the lower contents of heavy metals and significant fluctuations in the sediment profile. It reflects the heavy metals of sediments from mining rivers are not only influenced by mining tailings, but also by erosion material in the watershed.
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Received: 30 December 2011
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CHEN Huan-Yu, LIU Jing-Qing, WEI Zong-Yuan, ZHANG Hui-Hui, HE Xiao-Fang, ZHOU Xiao-Yan, QIU Shang-De, HU Bao-Lan, LOU Li-Ping. Radial differences in contaminant distribution in large-diameter pipe scales of main pipelines in drinking water distribution system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2706-2712. |
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