Ecotoxicological Response of Three Waste Samples in Relation to Chemical Speciation Modeling of Leachates

Extended leach testing (pH dependence TS 14429 and column TS 14405) provides options for chemical speciation modeling to determine the bioavailable fraction (“free” unbound concentrations of substances in solution) under varying conditions in the test methodology. For aquatic organisms, this has been shown to relate rather well with measured ecotoxicity (Cu in waste wood). Operational aspects of EN 14735 may need modification in the light of the suitability of the method for organic contaminants, the choice of liquid/solid separation in view of the level of dissolved organic carbon and colloids in solution and the relevant liquid to solid ratio for specific questions related to waste use, treatment and disposal.