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RECORD NUMBER: 14 OF 37

OLS Field Name OLS Field Data
Main Title Organic Carbon Partitioning as a Basis for Predicting the Toxicity of Chlorpyrifos in Sediments.
Author Ankley, G. T. ; Call, D. J. ; Cox, J. S. ; Kahl, M. D. ; Hoke, R. A. ;
CORP Author Environmental Research Lab.-Duluth, MN. ;Wisconsin Univ.-Superior. Lake Superior Research Inst.;Science Applications International Corp., Hackensack, NJ.
Publisher c1994
Year Published 1994
Report Number EPA/600/J-94/256;
Stock Number PB94-176153
Additional Subjects Sediments ; Toxicity ; Pesticides ; Invertebrates ; Benthic fauna ; Midges ; Pore water ; Concentration(Composition) ; Mortality ; Separation ; Biological indicators ; Organic compounds ; Carbon ; Water pollution monitoring ; Assaying ; Reprints ; Chlorpyrifos ; Chironomus tentans ; SQC(Sediment quality criteria) ; Bioavailability
Holdings
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Status
NTIS  PB94-176153 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/01/1994
Collation 8p
Abstract
The objective of the study was to evaluate an organic carbon partitioning model for predicting bioavailability of the organophosphate chlorpyrifos in sediments, in support of the development of a sediment-quality criterion for the pesticide. Initial 10-d water-only toxicity tests were conducted with the midge Chironomus tentans to define the sensitivity of this species to chlorpyrifos. Ten-day toxicity tests with Chironomus tentans were conducted with the spiked sediments under conditions similar to those in the water-only exposure. Based on predicted pore-water concentrations of chlorpyrifos, results of the water-only and sediment tests were in close agreement. Overall, these results suggest that within the range of organic carbon tested in the present study, an equilibrium partitioning model was based on organic carbon is appropriate for predicting the bioavailability of sediment-associated chlorpyrifos to benthic invertebrates.