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cje ›› 2011, Vol. 30 ›› Issue (05): 969-975.

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Spatial and temporal distribution of mercury species in water in Yelanghu Reservoir.

ZHANG Jun-fang1,2**, FENG Xin-bin3, YAN Hai-yu3, GUO Yan-na3, MENG Bo3, YAO Heng3   

  1. 1Guizhou Provincial Key Laboratory of Water Pollution Control &|Resource Reuse, Guiyang 550081, China|2Guizhou Institute of Environmental Science and Designing, Guiyang 550081, China|3State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
  • Online:2011-05-08 Published:2011-05-08

Abstract: A study was conducted during July 2006, January 2007 and March 2007 to determine the distribution of mercury species (total Hg (THg), dissolved Hg (DHg), particulate Hg (PHg)) and the impacts of some major controlling factors in the Yelanghu Reservoir, Guizhou, China. By comparison, the average concentrations of THg (4.48±2.59 ng·L-1), DHg (2.37±1.40 ng·L-1), PHg (2.11±1.86 ng·L-1) in the summer campaign are significantly higher (P<0.001) than those in the winter and spring campaigns, while no significant differences of concentrations of different mercury species are found between the latter two campaigns. Our investigation revealed that SPM and NO-3 may play an important role in controlling the seasonal distribution of mercury species in the reservoir. It is assumed that higher concentrations of mercury species in the summer could be a result of runoff impact. High runoff volume due to abundant precipitation in the summer carried Hg-containing particulates eroded from the agriculture-dominated watershed into the reservoir. Spatial distribution reveals that mercury concentrations generally decreased from the reservoir inlet to the outlet, while no notable vertical trends were found at each sampling site.

Key words: Plant alcohol extracts, Aphids, Parasitoids, Interferential index of population control(IIPC)