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Effect
of land-water ecotone on changes in heavy metal content in waters of
agricultural area |
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Barbara Szpakowska1, Bogdan Karlik2,
Hanna Gołdyn3
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1Department of Landscape Architecture at the August Cieszkowski
Agricultural University, 60-594 Poznań, Dąbrowskiego 159, e-mail: bszpa@au.poznan.pl 2Department
of Land Recultivation at the August Cieszkowski Agricultural University,
61-691 Poznań, Piątkowska 94 3Research
Centre of Agricultural and Forest Environment, Polish Academy of Sciences,
60-809 Poznań, Bukowska 19 |
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Abstract:
Concentrations of zinc,
cadmium and lead in ionic forms and in forms bound to humic substances
isolated from ground and surface waters of drainage catchment were analysed.
Higher total concentrations of examined metals were found in ground waters as
opposed to surface waters. Particularly clear difference was observed in case
of cadmium. Mean concentrations of cadmium in ground waters amounted to 0.92 µg l–1, whereas in surface waters
0.50 µg l–1. Similar tendency of higher
heavy metals concentrations in ground waters as compared to surface waters
was also observed in case of their ionic forms. Due to strong complexing properties
organic matter can bind large amounts of metals and therefore influence
bioavailability of the metals for aquatic organisms. Moreover the
distribution of metals in aquatic environment depends on the presence of such
biogeochemical barrier like belt of meadow, which can modify metals
migration. |
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Key words: ground and surface waters, zinc, cadmium, lead,
ecotones |