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WP15 Soil Ecotoxicology and Risk Assessment
(PAR-1117-808618) Elucidating the Bioavailability and Ecotoxicity of Soil Hydrocarbons in Laboratory Earthworm Toxicity Tests.
Parkerton, T1, Letinski, D1, Febbo, E1, Manning, R1, Jager, T2, 1 ExxonMobil Biomedical Sciences, Annandale, NJ, USA2 Department of Theoretical Biology, Vrije University Amsterdam, Amsterdam, Netherlands
ABSTRACT- To provide an improved understanding of the bioavailability and ecotoxicity of hydrocarbons spiked to natural soil, a series of acute toxicity and bioaccumulation experiments were performed with selected aliphatic and aromatic hydrocarbons (decalin, pentamethylheptane, phenanthrene and n-hexadecane) using the manure worm, Eisenia fetida. During toxicity tests, disposable polydimethylsiloxane (PDMS) fibers were added to test chambers to simulate partitioning of soil hydrocarbons to worm lipid. Observed toxicity results were compared to measured concentrations of test substances in soil, PDMS fibers and earthworms. Observed LC50s for the different hydrocarbons differed by more than two orders of magnitude when expressed in terms of soil concentration. Normalization of toxicity data to internal concentrations in the worms reduced differences between test compounds. The ability of PDMS fibers to mimic accumulation of test substances in worms differed between hydrocarbons. To gain insights into the differences observed in PDMS fiber and worm concentrations, a kinetic mass balance model was developed and applied to the soil test system. Model results are discussed and used to provide recommendations regarding use of PDMS fibers as a biomimetic extraction device in soil toxicity tests.
Key words: biomimetic extraction, soil toxicity, hydrocarbons, earthworm
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