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Scientific article
English

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

Published inEnvironmental pollution, vol. 160, p. 109-117
Publication date2012
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
  • Mercury
  • Monomethylmercury
  • Bioaccumulation
  • Reservoir
  • Fish
Funding
  • Autre - Sino-Swiss Science and Technology Cooperation (IZL CY2 123975)
Citation (ISO format)
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. doi: 10.1016/j.envpol.2011.09.023
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ISSN of the journal0269-7491
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