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Environmental hazard assessment by the Ecoscore system to discriminate PAH-polluted soils.
Environmental Science and Pollution Research International 2018 September
A bioassay battery-integrated index was applied to different soils sampled from a former coke factory, with the aim to evaluate the discriminating capacity of the Ecoscore system (ES) to assess the environmental hazard of PAH-polluted soils. Two soils from a former coke factory, polluted with polycyclic aromatic hydrocarbons (PAHs), were evaluated for their ecotoxicity to terrestrial and aquatic organisms and their genotoxicity. These soils have been already presented in a previous paper but data have been reanalyzed for the present article in an endeavor to standardize the ES. One soil was sampled in the untreated site and the second underwent a windrow treatment. While these soils had a similar total concentrations of US-EPA 16PAHs (around 3000 mg kg-1 ), different ecoscores were obtained when subjected to a set of solid- and liquid-phase bioassays measuring acute, chronic, and genotoxic effects. The total PAH content of the soil is not a pertinent parameter to assess soil pollution hazards contrary to the ES. ES is a robust method to classify soils according to their toxicity level. Four levels of toxicity have been defined: no (ecoscore = 0), weak (0 < ecoscore ≤33), moderate (33 < ecoscore ≤67), and strong toxicity (67 < ecoscore ≤ 100). The combination of chemical and toxicological data highlights the relationship between three-ring PAHs and acute ecotoxicity. Conversely, chronic effects of water extracts on algal growth could be explained by high molecular weight PAHs, such as five- and six-ring PAHs.
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