Bioavailability of sediment-sorbed chlorobenzenes to larvae of the midge, Chironomus decorus

Journal Article · Fri Apr 01 04:00:00 EST 1988 · Ecotoxicol. Environ. Saf.; (United States)

DOI:https://doi.org/10.1016/0147-6513(88)90076-0· OSTI ID:7125398

Knezovich, J P; Harrison, F L

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), Journal Name: Ecotoxicol. Environ. Saf.; (United States) Vol. 15:2; ISSN EESAD
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES
560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
AQUATIC ORGANISMS
AROMATICS
ARTHROPODS
BENTHOS
BIOLOGICAL AVAILABILITY
CHLORINATED AROMATIC HYDROCARBONS
CONTAMINATION
DIPTERA
GROUND WATER
HALOGENATED AROMATIC HYDROCARBONS
HYDROGEN COMPOUNDS
INSECTS
INTERSTITIAL WATER
INVERTEBRATES
ISOTOPE APPLICATIONS
ISOTOPES
LABELLED COMPOUNDS
LARVAE
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION
RADIOISOTOPES
SEDIMENTS
TRACER TECHNIQUES
UPTAKE
WATER
WATER POLLUTION