||Verification of a toxic organic substance transport and bioaccumulation model /
Schnoor, Jerald L. ;
Rao, Narasinga ;
Cartwright, Kathryn J. ;
Noll, Richard M. ;
Ruiz-Calzada, Carlos E.
||Iowa Univ., Iowa City.;Environmental Research Lab., Athens, GA.
|| U.S. Environmental Protection Agency, Environmental Research Laboratory,
Pesticides--Environmental aspects--Iowa. ;
Agricultural chemicals--Environmental aspects--Iowa.
Organic compounds ;
Water pollution ;
Mathematical models ;
Transport properties ;
Field tests ;
Laboratory equipment ;
Computer programming ;
Toxic substances ;
Biological processes ;
Pesticide residues ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||178 pages : illustrations ; 28 cm
A field verification of the Toxic Organic Substance Transport and Bioaccumulation Model (TOXIC) was conducted using the insecticide dieldrin and the herbicides alachlor and atrazine as the test compounds. The test sites were two Iowa reservoirs. The verification procedure included both steady-state analyses and quasi-dynamic simulations using time-variable flows and pollutant loadings along with model coefficients derived from laboratory and literature data. Laboratory measurements were used in simulations of alachlor, atrazine and dieldrin, and model predictions were well within an order of magnitude of field observations. For the herbicide alachlor, for example, laboratory protocol measurements were used directly in model simulations with excellent agreement between model predictions and measured concentrations. The TOXIC model, therefore, was considered to be field verified. Moreover, the successful field verification supports the validity of EPA's Exposure Analysis Modeling System (EXAMS), which handles pollutant transport and transformation kinetics in an almost identical manner.
Caption title. "EPA-600/3-83-007." Includes bibliographical references. Microfiche.