Abstract
To explore a comprehensive status of heavy metals in the Taihu Lake, which is one of the most important waters in China, water and sediment samples were taken throughout the lake during April to May of 2010, and metal elements (Cu, Cd, Cr, Ni, Pb, Sn, Sb, Zn, Mn) were analyzed in the water column, interstitial water and sediment. Relevant standards were used to assess the sediment and water quality. Results show that, in the lake water column, the average concentration of all metals ranged from 0.047 μg/l (Cd) to 8.778 μg/l (Zn). The concentration in the river water was usually higher than in the lake water for many metals. In the interstitial water Mn was significantly higher than that in water column, and other metals had no significant difference between the two media. In the surface sediment, average metal content ranged from 1.325 mg/kg (Cd) to 798.2 mg/kg (Mn). Spatially, contents of many metals were higher in Zhushan Bay than in other lake areas, and there existed a clear content gradient from the river to the lake for both water and sediment. On the sediment profiles, many metals presented an increasing trend from the depth of 15–20 cm to the top, which is indicative of the impact of increasingly intensive human activities from that period. Quality assessment indicates that metals in water phase are generally safe compared with USEPA “National Recommended Water Quality Criteria,” with the exception of Mn in the interstitial water and Sb in the river water. Whereas the sediment is widely contaminated with metals to some extent compared with the “Consensus-Based Sediment Quality Guidelines,” and Cu, Cr, and Ni are more likely to raise ecological risks. This work could be a basis for the ongoing China’s criteria strategy.
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Acknowledgements
This work was financially supported by China’s national basic research program (“973” program): “Water environmental quality evolution and water quality criteria in lakes” (2008CB418201). Dr. Ed Ongley kindly reviewed the manuscript and edited the content for English language.
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Tao, Y., Yuan, Z., Wei, M. et al. Characterization of heavy metals in water and sediments in Taihu Lake, China. Environ Monit Assess 184, 4367–4382 (2012). https://doi.org/10.1007/s10661-011-2270-9
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DOI: https://doi.org/10.1007/s10661-011-2270-9