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Whole-lake burdens and spatial distribution of cadmium in sediments of Wisconsin seepage lakes, USA

Environmental Toxicology and Chemistry

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, , , and

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Abstract

Cadmium was quantified in the surface sediments of six seepage lakes ranging from 8 to 70 ha in surface area, 6 to 20 m in maximum depth, 5.2 to 7.0 in mean epilimnetic pH, and 1.7 to 6.8 mg.L-1 in dissolved organic carbon. Within each lake, dry-weight concentrations of cadmium (range, 0.02-7.17 mu g.g(-1)) were positively correlated with volatile matter content of the sediments, which increased with water depth. Volumetric concentrations (i.e., mass per volume of met sediment) were correlated with water depth in only one lake, and they more accurately represented the spatial distribution of sedimentary cadmium within the lakes. Analysis of sediment cores from two of the lakes indicated that surface sediments were enriched with cadmium. The source of cadmium and the within-lake processes controlling deposition to the sediments were presumably similar among the lakes, as demonstrated by the strong correlation between lake area and whole-lake burdens of cadmium in the surface sediments (range, 625-5785 g/lake). Hence, cadmium in these lakes appears to be derived largely from atmospheric deposition. When normalized for lake area, cadmium burdens in the surface sediments ranged from 62 to 92 g.ha(-1) and were strongly correlated with dissolved organic carbon, but not with lake pH, which suggests a link between the transport of cadmium and organic matter to the sediments.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Whole-lake burdens and spatial distribution of cadmium in sediments of Wisconsin seepage lakes, USA
Series title:
Environmental Toxicology and Chemistry
Volume
19
Issue:
6
Year Published:
2000
Language:
English
Publisher:
Dow Corning Corp
Publisher location:
Auburn, MI
Contributing office(s):
Upper Midwest Environmental Sciences Center
Description:
pp. 1523-1531
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Toxicology and Chemistry
First page:
1523
Last page:
1531