Migration and Transformation of Mercury at Sediment-Water Interface of the Dahong Lake Reservoir in the Simian Mountains

被引：2
|
作者：
Guo P. [1 ]
Sun T. [1 ]
Yang G. [1 ]
Ma M. [1 ,2 ,3 ]
机构：
[1] College of Resource and Environment, Southwest University, Chongqing
[2] Chongqing Engineering Research Center for Agricultural Non-point Source Pollution Control in the Three Gorges Reservoir Area, Chongqing
[3] Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing
来源：
Ma, Ming (maming8312@163.com) | 2018年 / Science Press卷 / 39期
关键词：
Dahong Lake Reservoir; Dry season; Mercury; Sediment-water interface; Wet season;
D O I：
10.13227/j.hjkx.201804067
中图分类号：
学科分类号：
摘要：
The mercury production in forest ecosystems can be characterized by dynamic changes in forest lakes or reservoirs. Moreover, changes in the downstream mercury concentrations can also reflect the mercury output from forest ecosystems. Based on the analysis of distribution patterns and sediment profiles of mercury in DH1, DH2, DH3, and DH4 during the wet and dry seasons in the Dahong Lake Reservoir, the total mercury concentration of the Dahong Lake Reservoir increases significantly during the wet season (the average of the wet season is 4.33 ng•L -1 , the average of the dry season is 1.85 ng•L -1 ), especially in the downstream. The content of total mercury and methylmercury in the water column of the Dahong Lake Reservoir is significantly higher than that of background lake levels, but it is much lower than that of contaminated lakes, indicating that evergreen broad-leaved forest in the Simian Mountains has characteristics of Hg sources and the sediments are also sources of methylmercury and inorganic mercury in the water column of the Dahong Lake Reservoir. The methylation process mainly occurs in the surface layer of sediments and the methylation process is more active during the wet season. During the wet season, it is more favorable for mercury and methylmercury to enter the sediment liquid phase from the sediment solid phase and thus the water column. © 2018, Science Press. All right reserved.
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页码：5473 / 5479
页数：6
相关论文
共 29 条
  • [1] Mercury Study Report to Congress, (1997)
  • [2] Clarkson T.W., Magos L., Myers G.J., Human exposure to mercury: the three modern dilemmas, Journal of Trace Elements in Experimental Medicine, 16, 4, pp. 321-343, (2003)
  • [3] Stein E.D., Cohen Y., Winer A.M., Environmental distribution and transformation of mercury compounds, Critical Reviews in Environmental Science and Technology, 26, 1, pp. 1-43, (1996)
  • [4] Gill G.A., Bruland K.W., Mercury speciation in surface freshwater systems in California and other areas, Environmental Science & Technology, 24, 9, pp. 1392-1400, (1990)
  • [5] Feng X.B., Jiang H.M., Qiu G.L., Et al., Mercury mass balance study in Wujiangdu and Dongfeng Reservoirs, Guizhou, China, Environmental Pollution, 157, 10, pp. 2594-2603, (2009)
  • [6] Li F., Wang X., Luo J., Et al., Bioaccumulation of heavy metals in twigs and leaves of Abies fabri at Mount Gongga in China: a comparison study between 1999 and 2014, Environmental Science, 38, 7, pp. 3045-3053, (2017)
  • [7] Blackwell B.D., Driscoll C.T., Maxwell J.A., Et al., Changing climate alters inputs and pathways of mercury deposition to forested ecosystems, Biogeochemistry, 119, 1-3, pp. 215-228, (2014)
  • [8] Cheng Z.L., Luo Y., Zhang T., Et al., Deposition of sulfur, nitrogen and mercury in two typical forest ecosystems in southern China, Environmental Science, 38, 12, pp. 5004-5011, (2017)
  • [9] Ma M., Lai D.K., Sun T., Et al., Mercury dynamics and mass balance in a subtropical forest in southwest China, China Environmental Science, 37, 12, pp. 4744-4750, (2017)
  • [10] Jonsson S., Skyllberg U., Nilsson M.B., Et al., Differentiated availability of geochemical mercury pools controls methylmercury levels in estuarine sediment and biota, Nature Communications, 5, (2014)
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