Bioavailability of sediment-sorbed chlorobenzenes to larvae of the midge, Chironomus decorus
Larval stages of the midge, Chironomus decorus, were used to define the bioaccumulation of sediment-sorbed mono-, di-, tri-, and hexachlorobenzene. Larvae were exposed to high- and low-organic-content sediments that had been equilibrated with individual radiolabeled chlorobenzenes prior to testing. Equilibrium or nonequilibrium aqueous concentrations of the volatile test chemicals were flowed through sealed chambers in a sediment-water exposure system. The uptake of chlorobenzenes by midge larvae was rapid for all compounds tested, and apparent steady-state conditions were reached within 48 hr of exposure. Bioconcentration factors for the accumulation of chlorobenzenes from sediments and from interstitial and overlying waters were related to the octanol/water partition coefficients of the compounds. Because the diffusion of chlorobenzenes to overlying water during nonequilibrium flow through conditions was very slow, bioaccumulation was dependent on the concentration of the chemicals in interstitial water. These results show how benthic organisms may be able to accumulate significant levels of chlorinated aromatic compounds from ecosystems where their concentrations in the water column are relatively low.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- OSTI ID:
- 7125398
- Journal Information:
- Ecotoxicol. Environ. Saf.; (United States), Vol. 15:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CHLORINATED AROMATIC HYDROCARBONS
BIOLOGICAL AVAILABILITY
UPTAKE
DIPTERA
CONTAMINATION
SEDIMENTS
BENTHOS
INTERSTITIAL WATER
LABELLED COMPOUNDS
LARVAE
RADIOISOTOPES
TRACER TECHNIQUES
WATER POLLUTION
ANIMALS
AQUATIC ORGANISMS
AROMATICS
ARTHROPODS
GROUND WATER
HALOGENATED AROMATIC HYDROCARBONS
HYDROGEN COMPOUNDS
INSECTS
INVERTEBRATES
ISOTOPE APPLICATIONS
ISOTOPES
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION
WATER
560300* - Chemicals Metabolism & Toxicology
520101 - Environment
Aquatic- Basic Studies- Radiometric Techniques- (-1989)
520200 - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)