Whole-lake burdens and spatial distribution of mercury in surficial sediments in Wisconsin seepage lakes
Canadian Journal of Fisheries and Aquatic Sciences
By: R.G. Rada, D.E. Powell, and J.G. Wiener
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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.
Suggested Citation
Rada, R., Powell, D., Wiener, J., 1993, Whole-lake burdens and spatial distribution of mercury in surficial sediments in Wisconsin seepage lakes: Canadian Journal of Fisheries and Aquatic Sciences, v. 50, no. 4, p. 865-873.
| 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 |
| Larger Work Title | Canadian Journal of Fisheries and Aquatic Sciences |
| First page | 865 |
| Last page | 873 |