Bioaccumulation of polychlorinated dibenzo‐p‐dioxins in sediment by oligochaetes: Influence of exposure pathway and contact time
- 1 July 1997
- journal article
- research article
- Published by Oxford University Press (OUP) in Environmental Toxicology and Chemistry
- Vol. 16 (7) , 1518-1525
- https://doi.org/10.1002/etc.5620160728
Abstract
Oligochaetes (Lumbriculus variegatus) were exposed simultaneously to radiolabeled [3H]2,3,7,8‐tetrachlorodibenzo‐p‐dioxin (TCDD) and [14C]octachlorodibenzo‐p‐dioxin (OCDD) in sediment for 28 d, in order to study accumulation processes of hydrophobic substances. Elimination was studied for a further 20 d. The uptake and elimination rate constants and the bioaccumulation factors (BAFs) were determined for TCDD and OCDD in the presence and absence of sediment (overlying water). Steady‐state concentrations in oligochaetes were achieved for TCDD but not for OCDD over the 28‐d exposure. Biota‐sediment accumulation factors (BSAFs) after a 28‐d exposure were 1.6 ± 0.27 for TCDD and 0.07 ± 0.02 for OCDD. Steady‐state log BAF values (lipid based) for TCDD and OCDD in oligochaetes in the overlying water were 5.9 and 5.5 L/kg, respectively. The effect of incubation time between sediment and contaminants was investigated by repeating the accumulation study after a contact period of 21 months. BSAFs of sediment‐sorbed TCDD and OCDD were 1.5 to 2‐fold lower for the long contact time sediment. Based on comparison of predicted accumulation from pore water and observed accumulation by sediment‐exposed oligochaetes, it was concluded that 1.4‐fold greater accumulation occurred due to assimilation of TCDD and OCDD from ingested sediment. This additional accumulation in the presence of sediment, not accounted for by uptake only from pore waters, was consistent with literature data for other hydrophobic organochlorines.Keywords
This publication has 26 references indexed in Scilit:
- Gut content weight and clearance rate for three species of freshwater invertebratesEnvironmental Toxicology and Chemistry, 1996
- Long‐term fate and bioavailability of sediment‐associated polychlorinated dibenzo‐p‐dioxins in aquatic mesocosmsEnvironmental Toxicology and Chemistry, 1995
- Bioavailability of polycyclic aromatic hydrocarbons from a historically contaminated sediment coreEnvironmental Toxicology and Chemistry, 1995
- The toxicokinetic behavior of chlorobenzenes in earthworm (Eisenia andrei) experiments in soilEnvironmental Toxicology and Chemistry, 1994
- Do aquatic effects or human health end points govern the development of sediment‐quality criteria for nonionic organic chemicals?Environmental Toxicology and Chemistry, 1993
- Use of the aquatic oligochaete Lumbriculus variegatus for assessing the toxicity and bioaccumulation of sediment‐associated contaminantsEnvironmental Toxicology and Chemistry, 1993
- Bioaccumulation and biotransformation of polychlorinated dibenzo‐p‐dioxins and dibenzofurans in fishEnvironmental Toxicology and Chemistry, 1990
- Comparative uptake of hexachlorobenzene by fathead minnows, amphipods and oligochaete worms from water and sedimentEnvironmental Toxicology and Chemistry, 1988
- Reverse-phase separation method for determining pollutant binding to Aldrich humic acid and dissolved organic carbon of natural watersEnvironmental Science & Technology, 1984
- Availability of a Hexachlorobiphenyl Isomer to Benthic Amphipods from Experimentally Contaminated Natural SedimentsPublished by ASTM International ,1982