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Ecotoxicological endpoints for contaminated site remediation
J Jeffrey Wilson1, James F Hatcher, J Stephen Goudey
1HydroQual Laboratories Ltd, 3, 6125 12 Street S.E., T2H2K1, Calgary, Alberta, Canada. jjwilson@golder.com
Annali Dell'Istituto Superiore Di Sanita
|October 22, 2002
Summary
Chemical criteria may misjudge site cleanup needs. Ecotoxicity testing offers a direct environmental impact assessment, revealing that certain crude oil fractions are less toxic than gross hydrocarbon measures suggest.
Area of Science:
- Environmental Toxicology
- Soil Science
- Ecotoxicology
Background:
- Chemical criteria for contaminated sites may inaccurately assess cleanup requirements.
- Ecotoxicity testing provides a more direct measure of environmental harm.
Purpose of the Study:
- To evaluate the soil ecotoxicity of different crude oil fractions.
- To compare ecotoxicity results with chemical criteria (Total Petroleum Hydrocarbons).
Main Methods:
- A multi-trophic soil ecotoxicity assessment was performed.
- Soil was contaminated with five crude oil fractions based on hydrocarbon chain length.
Main Results:
- The crude oil fraction above C26 showed no toxicity to microbes, plants, or earthworms.
- This non-toxic fraction was present at concentrations exceeding the 1000 mg/kg Total Petroleum Hydrocarbon (TPH) criterion.
- Ecotoxicity tests revealed weathered heavy crude oils can be less toxic than lighter, fresh oils, a difference not detected by TPH alone.
Conclusions:
- Ecotoxicity testing is superior to chemical criteria for assessing the actual environmental risk of contaminated soils.
- Hydrocarbon chain length significantly influences the toxicity of crude oil contaminants.
- Standard chemical measures like TPH may not adequately differentiate the ecotoxicological impact of different petroleum products.