RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2009, Vol. 18 >> Issue (4): 356-.

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TEMPORAL AND SPATIAL DISTRIBUTION OF TOTAL AND METHYL MERCURY IN INFLOWS AND OUTFLOWS OF CASCADE RESERVOIRS IN WUJIANG RIVER

GUO Yanna1,2,FENG Xinbin1,YAN Haiyu1,QIAN Xiaoli3,MENG Bo1,YAO Heng1
   

  1. (1.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002, China|2.Guiyang Hydropower Investigation Design &|Research Institute,China Hydropower Engineering Consulting Group,Guiyang 550081, China|3.College of Resources &|Environment,Guizhou University,Guiyang 550003, China)
  • Online:2009-04-20

Abstract:

Water samples were monthly collected in inflows and outflows of cascade reservoirs in Wujiang River from January to December in 2006.Total mercury and methyl mercury concentrations were analyzed by cold vapor atomic fluorescence spectrometry and aqueous phase ethylation,GC separation,and CVAFS detection.The results were as follows:(1) Annual volumeweighted mean concentrations of total mercury were 317 and 2.34 ng/L,and methyl mercury concentrations were 014 and 0.18 ng/L in inflows and outflows,respectively.There were different mercury distribution characteristics in inflows and outflows of different reservoirs.(2) Total mercury concentrations in inflows were significantly lower than those in outflows,and showed an obvious seasonal variation in Puding and Hongjiadu Reservoir which was the first cascade reservoir in Sancha River and Liuchong River,respectively.However,markedly seasonal variations of methyl mercury were observed in outflows,and their concentrations were obviously higher than those in inflows only in older reservoirs (Puding Reservoir,Dongfeng Reservoir,Wujiangdu Reservoir).(3) Correlation analysis showed total mercury and methyl mercury concentrations in inflows were influenced by suspended matter,and their correlation with water volume varied with the location of reservoir.There was significant positive correlation in the upstream Puding and Hongjiadu reservoirs,and negative correlation in other reservoirs.

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