Damming effect on the distribution of mercury in Wujiang River
Seasonal changes in total mercury concentrations in surface water were observed for the Wujiang River, with higher values at the time of greater flow. The total mercury in this river was mostly associated with suspended particles, particulate mercury accounting for 84% of the total mercury flux on average during the high flow period, and 52% of the total mercury flux on average in the low flow period. Significant losses of Hg from the water were observed in the downstreams of the reservoir. In addition, the concentrations of particulate mercury in the downstreams of reservoir appeared to have been enhanced by sediment re-suspension and shoreline erosion caused by flood discharge, while the filtered portion decreased. These observations suggested that reservoirs played an important role in controlling the transport and fate of mercury in the Wujiang River.
Key wordsdamming reservoir mercury
Unable to display preview. Download preview PDF.
- Han Guilin and Liu Congqiang (2001) Hydrogeochemistiy of Wujiang River water in Guizhou Province, China [J].Chinese Journal of Geochemistry.22, 240–248.Google Scholar
- Jiang Hongmei, Feng Xinbin, Dai Qianjing, and Wang Yuchun (2004) A primary study on speciation and distribution of mercury in Wujiang River [J].Environmental Chemistry.22, 560–565 (in Chinese with English abstract).Google Scholar
- McCully P. (1996) Silenced Rivers — The Ecology and Politics of Large Dams [M].Zed Books, London.Google Scholar
- Vörösmarty C. J., Sharma K. P., Fekete B. M., Copeland A. H., Holden J., Marble J., and Lough J. A. (1997) The storage and aging of continental runoff in large reservoir systems of the world [J].Ambio.26, 210–219.Google Scholar
- Yan Haiyu, Feng Xinbin, Shang Lihai, Tang Shunlin, and Qiu Guangle (2003) Speciation analysis of ultra trace levels of mercury in natural waters [J].Journal of Instrumental Analysis.22, 10–13 (in Chinese with English abstract).Google Scholar