Water Air & Soil Pollution

, Volume 56, Issue 1, pp 477–491

Impact of acidification on the methylmercury cycle of remote seepage lakes

  • Nicolas S Bloom
  • Carl J. Watras
  • James P. Hurley

DOI: 10.1007/BF00342293

Cite this article as:
Bloom, N.S., Watras, C.J. & Hurley, J.P. Water, Air, and Soil Pollution (1991) 56: 477. doi:10.1007/BF00342293


Concentrations of monomethylmercury [CH3Hg] were measured in the water and seston of five nearly pristine Wisconsin lakes, which span a range of pH from about 4.6 to 7.2. Previous studies had established a clear inverse relationship between [CH3Hg] in fish and the pH of lakes in this region. Here, we examined the pH dependency of [CH3Hg] in lake water and explored the partitioning of CH3Hg between water, seston, and fish as a function of pH. Results indicate that [CH3Hg] in lake water tends to increase as pH decreases, but that seasonal and spatial variability of [CH3Hg] in individual lakes confounds a simple analysis of the relationship. The partitioning of CH3Hg was related only weakly, if at all, to pH. Average partitioning coefficients (log kd=log (Cp/Cw)) were higher for yearling yellow perch (6.0 to 6.5) than for seston (5.5 to 6.0) but did not vary significantly between lakes. This suggests that acidification has a stronger effect on the supply of CH3Hg to the ecosystem than on specific rates of uptake by the biota.

Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • Nicolas S Bloom
    • 1
  • Carl J. Watras
    • 2
  • James P. Hurley
    • 3
  1. 1.Brooks Rand, Ltd.SeattleUSA
  2. 2.Bureau of Research Wisconsin Dept. of Natural Resources & Center for LimnologyUniversity of Wisconsin MadisonBoulder JunctionUSA
  3. 3.Center for Limnology University of WisconsinMadisonUSA

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