期刊
ENVIRONMENTAL POLLUTION
卷 160, 期 -, 页码 109-117出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2011.09.023
关键词
Mercury; Monomethylmercury; Bioaccumulation; Reservoir; Fish
资金
- Sino-Swiss Science and Technology Cooperation (SSSTC) [IZL CY2 123975]
- Chinese Academy of Sciences [GJHZ903]
We examined Hg biogeochemistry in Baihua Reservoir, a system affected by industrial wastewater containing mercury (Hg). As expected, we found high levels of total Hg (THg, 664-7421 ng g(-1)) and monomethylmercury (MMHg, 3-21 ng g(-1)) in the surface sediments (0-10 cm). In the water column, both THg and MMHg showed strong vertical variations with higher concentrations in the anoxic layer (>4m) than in the oxic layer (0-4 m), which was most pronounced for the dissolved MMHg (p < 0.001). However, mercury levels in biota samples (mostly cyprinid fish) were one order of magnitude lower than common regulatory values (i.e. 0.3-0.5 mg kg(-1)) for human consumption. We identified three main reasons to explain the low fish Hg bioaccumulation: disconnection of the aquatic food web from the high MMHg zone, simple food web structures, and biodilution effect at the base of the food chain in this eutrophic reservoir. (C) 2011 Elsevier Ltd. All rights reserved.
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