A Procedure to assess Contaminated Soil Ecotoxicity
Abstract :Two polluted soil samples were assessed for both acute (Microtox®,Daphnia magna,Thamnocephalus platyurus) and chronic (Pseudokirchneriella subcapitata) toxicity, as well as for genotoxicity (Mutatox®). Bioassays were performed on soil water leachates and on soil solvent extracts to characterize not only the water soluble pollutants but also to evaluate less soluble pollutants or bound to soil fractions.Coupling water leaching and solvent extractions to acute, chronic and genotoxicity bioassays allows us to define a step by step procedure to characterise the ecotoxicological hazard of soils. This procedure helps in defining the mobility and identifying the nature of the pollutants responsible for the measured toxicity. It can be used (i) to indentify the hazard, (ii) to classify soil hazards and in so doing to map contaminated sites qualitatively (locating more polluted areas), (iii) to monitor and judge treatment success (iv) to control rehabilitated sites.