Heavy metals in sediments as evidence for recent pollution and quasi-estuarine processes: an example from Lake Druzno,Poland |
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| Authors: | Wojciech Tylmann Roman Go??biewski Piotr Pawe? Wo?niak Karolina Czarnecka |
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| Institution: | (1) Department of Geomorphology and Quaternary Geology, Institute of Geography, Gdańsk University, Dmowskiego 16a, 80-264 Gdańsk, Poland |
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| Abstract: | This article presents the results of a geochemical investigation of sediments from Lake Druzno (northern Poland), a reservoir
fed by freshwater from the catchment, with periodic input of brackish water from Vistula Lagoon. This study analyzed the spatial
variation in heavy metal content in surface sediments as well as the temporal changes in metal content in two sediment cores
dated using the 210Pb method. In the surface sediments, the highest metal concentrations were recorded in the northern part of the lake, with
lower concentrations in the central and southern parts. Absolute values of metal concentrations in the cores were low, but
normalization with respect to Al showed an increase during the second half of the 20th century. Mean enrichment factors (EF)
in sediments from the second half of the 20th century ranged from insignificant (1–1.2) for Fe to (1.55–3.3) for Cu, Cd, Pb
and Zn. The sediments deposited before 1950 had lower EF values (>1.5) and had low variability. Results from both the surface
sediments and the cores indicate that the main source of lake pollution is brackish water intrusion from the Vistula Lagoon
via the contaminated River Elbląg. |
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| Keywords: | Lake sediments Heavy metals 210Pb Quasi-estuary Poland |
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