Recovery from Mercury Contamination in the Second Songhua River, China
Mercury pollution in the Second Songhua River (SSR) was serious in the last century due to effluent from a chemical corporation. Effects of riverine self-purification on mercury removal were studied by comparing monitoring data of mercury concentrations varieties in water, sediment, and fish in the past, about 30 years. The present work suggested that a river of such a size like the SSR possessed the potential ability to recover from mercury pollution under the condition that mercury sources were cut off, though it needs a very long time, which might be several decades or even a century of years. During the 30 years with no effluent containing mercury input, total mercury (T-Hg) of water and sediment in some typical segments, mostly near the past effluent outlet, had decreased radically but still higher than the background values, though the decrease amplitudes were over 90% compared with that in 1975. T-Hg had decreased by more than 90% in most fishes, but some were still not suitable for consumption. Methylmercury concentrations (MeHg) of water, sediment, and fish were higher or close to the background levels in 2004. In the coming decades, the purification processes in the SSR would be steady and slow for a long period.
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- Recovery from Mercury Contamination in the Second Songhua River, China
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Water, Air, & Soil Pollution
Volume 211, Issue 1-4 , pp 219-229
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- 1. Key Laboratory of Wetland Ecology and Environment, Institute of Northeast Geography and Agroecology, Chinese Academy of Science, 130012, Changchun, People’s Republic of China
- 2. Graduate University of Chinese Academy of Sciences, 100049, Beijing, People’s Republic of China
- 3. Key Laboratory of Eco-remediation of Contaminated Environment and Resource Reuse, Shenyang University, 110044, Shenyang, People’s Republic of China