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Whole-lake burdens and spatial distribution of mercury in surficial sediments in Wisconsin seepage lakes

Canadian Journal of Fisheries and Aquatic Sciences

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Abstract

We quantified total mercury in surficial sediments (uppermost 5 cm) of six small seepage lakes. Fifty cores were taken from each lake, based on a random sampling design stratified by water depth. Volumetric concentrations (mass per volume of wet sediment) more accurately portrayed the depth distribution of mercury in the lakes than did dry-weight concentrations, which underrepresented the significance of the shallow-water sediments as a reservoir of potentially available mercury. Estimates of whole-lake burdens (masses) of mercury in the surficial sediment, which represents the maximum amount of sedimentary mercury available for methylation, ranged from 45 to 149 g. We hypothesize that the observed variation in areal burdens of mercury was partly due to variation among lakes in the pH-related efflux of gaseous mercury (Hg super(0)) from the lakes to the atmosphere.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Whole-lake burdens and spatial distribution of mercury in surficial sediments in Wisconsin seepage lakes
Series title:
Canadian Journal of Fisheries and Aquatic Sciences
Volume
50
Issue:
4
Year Published:
1993
Language:
English
Publisher:
University of Wisconsin River Studies Center
Contributing office(s):
Upper Midwest Environmental Sciences Center
Description:
pp. 865-873
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
865
Last page:
873
Number of Pages:
9