Abstract
Sediment samples were taken from the Tisza–Szamos area and Gödöllő lake system. A new sequential extraction scheme in a supercritical extractor using supercritical CO 2, subcritical H 2O, and a subcritical mixture of 90% H 2O and 10% CO 2 as solvents was employed. This procedure provides relevant information about environmentally mobile heavy metal fractions (water-soluble, bicarbonate-forming) of sediments during a reasonably short time (5 h). The environmental mobility of Zn and Cd was found to be the highest among the sediments involved in these investigations. This mobility represents detectable ecotoxicity, which can be tested with the subcritical water extracts. Performance of pollen tube growth (PTG) test and the ecotoxicological stable isotope metabolic assay (ESIMA) was compared. Potential ecotoxicity of aqueous extracts was reliably detectable by PTG test during a relatively short time (1 day).
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