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Bioavailability and assimilation of sediment‐associated benzo[ a ]pyrene by Ilyodrilus templetoni (oligochaeta)
Author(s) -
Lu Xiaoxia,
Reible Danny D.,
Fleeger John W.
Publication year - 2004
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1897/03-39
Subject(s) - bioaccumulation , bioavailability , environmental chemistry , pyrene , sediment , chemistry , biotransformation , desorption , benzo(a)pyrene , bioconcentration , dry weight , toxicokinetics , toxicity , adsorption , biology , biochemistry , organic chemistry , botany , paleontology , enzyme , bioinformatics
Benzo[ a ]pyrene (B a P)‐amended sediment was desorbed by a sequential batch method using an isopropanol solution wash. The observed isotherm showed no evidence of desorption resistance, as indicated by increased partitioning to the solid phase at low concentrations. This was consistent with the prediction of minimal desorption resistance for highly hydrophobic compounds using a biphasic model. Bioavailability of B a P in desorbed sediments was assessed by toxicokinetic measures of uptake, bioaccumulation, and elimination in the deposit‐feeding, freshwater tubificid oligochaete Ilyodrilus templetoni. Worms were exposed to sediments with B a P concentrations of approximately 26 and 11 μg/g dry weight sediment after desorption for one and three batches, respectively. The I. templetoni tissue concentration attained an apparent steady state after approximately one month and resulted in a biota‐sediment accumulation factor of approximately 1.3 for both sediments. This is consistent with the paradigm that pore‐water concentration predicts the uptake of organic contaminants into lipids despite the literature data showing that the major uptake route for B a P is likely from the ingestion of sediment particles. Ilyodrilus templetoni exhibited a high assimilation efficiency (80%) during a single‐gut passage, a low elimination rate ( k e = 0.0032 h −1 ), and negligible biotransformation of sediment‐associated B a P.