Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Energy model of a cadmium stream with correlation of embodied energy and toxicity {microform} /
Author Knight, Robert Lee
CORP Author Florida Univ., Gainesville. Dept. of Environmental Engineering Sciences.;Environmental Research Lab., Athens, GA.
Publisher U.S. Environmental Protection Agency, Environmental Research Laboratory,
Year Published 1982
Report Number EPA/600/3-82/048; EPA-R-806080
Stock Number PB82-256876
Subjects Cadmium--Isotopes--Spectra ; Pollution--Environmental aspects--United States
Additional Subjects Water pollution ; Mathematical models ; Cadmium ; Toxicity ; Transport properties ; Ecosystems ; Toxic substances ; Energy models ; Heavy metals ; Environmental management
Library Call Number Additional Info Location Last
NTIS  PB82-256876 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation 127 p. : ill. ; 28 cm.
In surviving systems that have evolved designs for maximizing power, ability to amplify and control may be in proportion to embodied energy. The evaluation of control effect and energy required in equivalent embodied energy units allows the direct correlation of these two properties of a controller such as a toxic chemical. The heavy metal cadmium (Cd) was used to analyze this toxin control hypothesis. A literature review indicated a stimulatory (Arndt-Schulz) effect of Cd at low concentrations in many growth studies. Most data sets were found to be described by a general subsidy-stress curve. The bioconcentration of Cd as a mechanism in natural systems for controlling free Cd concentration and its toxic effect is discussed. Information collected during previous research on Cd effect in experimental streams was summarized and used to calibrate an energy and material model of the Cd streams. Several mechanisms of Cd toxicity were examined and the model includes a simulation of system components at low Cd levels. The results of this study with Cd are predicted to be general to most other toxic substances and may allow synthesis of the burgeoning quantity of information concerning chemicals in the environment.
Caption title. "April 1982." "EPA-600/3-82-048." Microform.