Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4427475 | Environmental Pollution | 2006 | 9 Pages |
Abstract
Turbation is hypothesized to affect the redistribution of heavy metals in polluted floodplain soils by effects on mobility. This hypothesis was tested in microcosms by turbation of zinc-spiked sediment top layers. Manual turbation caused a fast decrease of the zinc content in the upper 15Â cm of the soil, even though turbation was only applied to the upper two centimetres. It was especially zinc attached to colloid and organic matter particles that was redistributed from the top layer. Percolation processes resulted in the attached zinc being drained to depths of more than 15Â cm. The decrease in zinc content of the topsoil was even stronger in combination with inundation. No indications were found for the redistribution of zinc as a result of an increase of the extractability with 0.01Â M CaCl2 or changes in pH. The findings suggest that mechanical turbation and bioturbation may redistribute heavy metals from topsoils in polluted floodplains just after inundation as observed in these turbation experiments.
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Environmental Science
Environmental Chemistry
Authors
Sander Wijnhoven, Gerard van der Velde Gerard van der Velde, Rob S.E.W. Leuven, Herman J.P. Eijsackers, Antonius J.M. Smits,