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Title

Insights into low fish mercury bioaccumulation in a mercury-contaminated reservoir, Guizhou, China

Authors
Yan, Haiyu
Wang, Cuiping
Li, Qiuhua
Spangenberg, Jorge E.
Feng, Xinbin
Published in Environmental Pollution. 2012, vol. 160, p. 109-117
Abstract 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) and monomethylmercury (MMHg, 3-21 ng/g) in the surface sediments (0e10 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 (0e4 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. 0.3e0.5 mg/kg) 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
Keywords MercuryMonomethylmercuryBioaccumulationReservoirFish
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Project Sino-Swiss Science and Technology Cooperation (IZL CY2 123975)
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LIU, Bian et al. Insights into low fish mercury bioaccumulation in a mercury-contaminated reservoir, Guizhou, China. In: Environmental Pollution, 2012, vol. 160, p. 109-117. https://archive-ouverte.unige.ch/unige:36927

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Deposited on : 2014-05-26

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