title: Supercritical carbon dioxide extraction as a predictor of polycyclic aromatic hydrocarbon bioaccumulation and toxicity by earthworms in manufactured-gas plant site soils.
abstract: The toxicity and uptake of polycyclic aromatic hydrocarbons (PAHs) by earthworms were measured in soil samples collected from manufactured-gas plant sites having a wide range in PAH concentrations (170-42,000 mg/kg) and soil characteristics. Samples varied from vegetated soils to pure lampblack soot and had total organic carbon contents ranging from 3 to 87%. The biota-soil accumulation factors (BSAFs) observed for individual PAHs in field-collected earthworms (Aporrectodea caliginosa) were up to 50-fold lower than the BSAFs predicted using equilibrium-partitioning theory. Acute toxicity to the earthworm Eisenia fetida was unrelated to total PAH concentration: Mortality was not observed in some soils having high concentrations of total PAHs (>42,000 mg/kg), whereas 100% mortality was observed in other soils having much lower concentrations of total PAHs (1,520 mg/kg). Instead, toxicity appeared to be related to the rapidly released fraction of PAHs determined by mild supercritical CO2 extraction (SFE). The results demonstrate that soils having approximately 16,000 mg rapidly released total PAH/kg organic carbon can be acutely toxic to earthworms and that the concentration of PAHs in soil that is rapidly released by SFE can estimate toxicity to soil invertebrates.
authors: Institute for Comparative and Environmental Toxicology and Department of Soil, Crop, and Atmospheric Sciences, Cornell University, Ithaca, New York 14851, USA. jkreitinger@retec.com
authors: Joseph P
authors: JP
authors: Kreitinger
authors: Antonio
authors: A
authors: Quiñones-Rivera
authors: Edward F
authors: EF
authors: Neuhauser
authors: Martin
authors: M
authors: Alexander
authors: Steven B
authors: SB
authors: Hawthorne
mesh_terms: D000818:Animals; D002245:Carbon Dioxide / Q000737:chemistry / Q000302:isolation & purification*; D005740:Gases; D007221:Industry; D009835:Oligochaeta / Q000187:drug effects* / Q000378:metabolism*; D011084:Polycyclic Aromatic Hydrocarbons / Q000378:metabolism* / Q000633:toxicity*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D005740:Gases; D011084:Polycyclic Aromatic Hydrocarbons; D012989:Soil Pollutants; D002245:Carbon Dioxide