Record Display for the EPA National Library Catalog

RECORD NUMBER: 7 OF 9

OLS Field Name OLS Field Data
Main Title Physiologically-Based Toxicokinetic Modeling of Three Waterborne Chloroethanes in Channel Catfish, 'Ictalurus punctatus'.
Author Nichols, J. W. ; McKim, J. M. ; Lien, G. J. ; Hoffman, A. D. ; Bertelsen., S. L. ;
CORP Author Environmental Research Lab.-Duluth, MN. ;AScI Corp., Duluth, MN.;Air Force Office of Scientific Research, Bolling AFB, DC.
Publisher c1993
Year Published 1993
Report Number EPA/600/J-94/182; AFOSR-ISSA-89-0060;
Stock Number PB94-163615
Additional Subjects Channel catfish ; Toxicology ; Chloroethanes ; Water pollution effects(Animals) ; Biological monitoring ; Trout ; Tissue distribution ; Respiration ; Gills ; Blood ; Physiology ; Reprint ; Ictalurus punctatus
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB94-163615 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 09/01/1994
Collation 31p
Abstract
A physiologically-based toxicokinetic model for fish was used to describe the uptake and disposition of three chlorinated ethanes in channel catfish (Ictalurus punctatus). Catfish were simultaneously exposed to 1,1,2,2-tetrachloroethane (TCE), pentachloroethane (PCE), and hexachloroethane (HCE) in fish respirometer-metabolism chambers to assess the kinetics of chemical accumulation in arterial blood and chemical extraction efficiency from inspired water. Chemical residues in tissues were measured at the end of each experiment. These data were used to evaluate the accuracy of model simulations and to form a basis for comparison with information collected previously from rainbow trout. TCE was at or near steady-state in catfish after 48 h. For PCE and HCE the time to steady-state appeared to be considerably longer than 48 h. Parameterized with in vitro chemical partitioning information, the model accurately simulated the accumulation of TCE in arterial blood and its uptake from inspired water, but consistently underestimated the uptake and accumulation of both PCE and HCE. The cause of these discrepancies was not conclusively determined; however, several possible sources of error were evaluated, including physiological and chemical partitioning inputs, and underlying modeling assumptions. A comparison of data sets and modeling efforts for rainbow trout and channel catfish suggests that gross similarities between the two species can be attributed to the comparability of relevant physiological and chemical partitioning parameters.