Geochemical behaviour of heavy metals in a sedimentation area of the rivers Rhine and Meuse

摘要: The Biesbosch, situated in the delta of rivers Rhine and Meuse Netherlands, is considered an important freshwater tidal area, although amplitude has decreased as a result implementation Delta Worles. Due to decrease flow rates since closure ofthe area by sluices 1970, Biesbosch developed into semi-stagnant sedimentary basin, which deposition fine-grained highly contaminated calcareous sediments takes place. Dutch environmental policy aims at nature development this increasing number wetlands enlarge intertidal area. To achieve sustainable situation ecological factors are also considered, long-term behaviour contaminants their ecotoxicological effects should be well recognised (Chapter 1). bioavailability heavy metals (temporarily) waterlogged soils strongly coupled variation intensity ofredox processes. purpose study was describe redox chemistry mobility ofheavy hydric emission groundwater surface water. results used evaluate quality criteria assess potential metal toxicity sediments.