Trace metal dynamics in a seasonally anoxic lake |
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| Authors: | K Morfett W Davison J Hamilton-Taylor |
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| Institution: | (1) Freshwater Biological Association, Ambleside, England;(2) Department of Environmental Science, University of Lancaster, Lancaster, England |
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| Abstract: | Selected results are presented from a detailed 12-month study of trace metals in a seasonally anoxic lake. Dissolved concentrations
of Fe, Mn, organic carbon, Cd, Cu, Pb, Zn, and pH were determined in the water column and the interstitial waters on 39 occasions.
Trace metal concentrations remained low throughout the year in both water column and pore waters. There was evidence for some
remobilization at the sediment-water interface but sediments deeper than 3 cm acted as a sink throughout the year. Variations
in the water concentrations were largely associated with increased loading during periods of heavy rainfall. During the summer,
concentrations of Cu and Zn in the waters overlying the sediments were enhanced by release from decomposing algal material.
Similarly, enhanced concentrations of Cd, Cu, Pb, and Zn were observed during periods of much reduced mixing during ice-cover.
Although there were large seasonal variations in the concentrations of dissolved and particulate Fe and Mn, there were no
comparable changes in the concentrations of trace metals. |
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