Record Display for the EPA National Library Catalog


Main Title Evaluation of Mathematical Models for the Effects of pH and Temperature on Ammonia Toxicity to Aquatic Organisms.
Author Erickson, R. J. ;
CORP Author College of Saint Scholastica, Duluth, MN. Dept. of Chemistry.;Environmental Research Lab., Duluth, MN.
Year Published 1985
Report Number EPA-R-809367 ;EPA-R-809240; EPA/600/J-85/527;
Stock Number PB88-205794
Additional Subjects Ammonia ; Toxicity ; Water pollution ; Marine microorganisms ; Mathematical models ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB88-205794 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14p
Available data on the pH and temperature dependence of ammonia toxicity to aquatic organisms were examined and their agreement with various models was evaluated. A model which considers alteration of the relative concentration of un-ionized ammonia at the gill surface failed to adequately describe either pH or temperature dependence. A model that assumes that un-ionized ammonia and ammonium ion are jointly toxic was strongly supported by the data on pH dependence, but could not explain observed temperature dependence. Temperature dependence can be described empirically by a simple log-linear model. The effects of pH and temperature were generally found to be qualitatively and quantitatively similar among fish species. (Copyright (c) 1985 Pergamon Press Ltd.)