Young Scientists Day of the Belgian Soil Science Society- Abstracts
Young Scientists Day of the Belgian Soil Science Society location:Brussels, Royal Academy for Science and Letters date:25 February 2009
The understanding of the behaviour and fate of contaminants in soils and sediments is essential to deal with their management. In the present study, heavy-metal contaminated anoxic sediments with different physico-chemical properties and originating from different locations (nl. The Dijle and the Nete catchment) were exposed to oxidizing conditions. The evolution of sediment properties and porewater composition during sediment ripening was monitored during 20 weeks. This study illustrates that total metal concentrations in sediments are not a good criterion to evaluate the risk of heavy metal release from the oxidising sediments to the environment, as a more important release of heavy metals is sometimes observed in sediments with a lower total metal content The clay content of the samples, together with their acid neutralizing capacity, and the precipitation of secondary minerals were important parameters that influenced porewater composition during oxidation and ripening.