Structure and content of pollutants in temporal surface sediments in small watersheds |
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Authors: | Eva Nordlund Anders Düker Stefan Karlsson Anna Ledin Per Sandén Karin Sundblad |
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Institution: | Department of Water and Environmental Studies, Link?ping University, S-581 83 Link?ping, Sweden |
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Abstract: | ABSTRACTFormation of gel-like surface sediments has been observed during spring and autumn in small watersheds in boreal areas with pH <5.7 and concentrations of humic substances above 3 mg L?1. This structure efficiently accumulates dissolved, colloidal and particulate constituents. The gel consists of ferric (hydr)oxides and fulvic acid and has high viable counts of bacteria (notably Gallionella spp.) as well as fungal hyphae. The solid/solution distribution (log Kd; l kg?1) for trace metals (Cd, Cu, Pb, V, Zn) ranges from 4 to 6.5 which indicate an efficient accumulation during periods with gel. The concentrations of adsorbable organic halogens in the gel were not different from forest soils in general. |
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Keywords: | Surface sediment trace metals Gallionella spp boreal spruce forest |
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