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L. Leleyter J. L. Probst Ecole et Observatoire des Sciences de la Terre, Centre de Gfochimie de la Surface (CNRS/ULP), 67084 Strasbourg Cedex, France The mobility, the transport, and the toxicity of trace elements in aquatic systems depend on the chemical form of the elements which is controlled by the physico-chemical and biological characteristics of that environment such as salinity, pH, redox potential, and concentration of chelators. In order to study the bioavailable fraction of river sediments, an analytical procedure involving sequential chemical extractions (soluble with water (eau), really exchangeable (ech), bound to carbonates (carb), manganese oxides (MnO), amorphous iron oxides (AFeO), crystalline iron oxides (CFeO) and organic matter (org)). This procedure has been developed from an improvement of Tessier |
