Record Display for the EPA National Library Catalog


Main Title Toxicity of Ammonia to Early Life Stages of the Smallmouth Bass at Four pH Values.
Author Broderius, S. ; Drummond, R. ; Fiandt, J. ; Russom, C. ;
CORP Author Environmental Research Lab.-Duluth, MN.
Year Published 1985
Report Number EPA/600/J-85/032;
Stock Number PB85-198307
Additional Subjects Bass ; Ammonia ; Toxicity ; Water pollution ; Embryos ; Exposure ; Concentration(Composition) ; pH ; Life cycles ; Tests ; Tolerances(Physiology) ; Larvae ; Mortality ; Reprints ; Micropterus dolomieui
Library Call Number Additional Info Location Last
NTIS  PB85-198307 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 13p
Early life stages of smallmouth bass (Micropterus dolomieui Lacepede) were exposed to ammonia concentrations at four different pH values (from 6.5 to 8.7). Acute lethal tests were conducted with juveniles, and partial chronic tests were initiated at the late embryo stage and extended through 32 d of exposure. The 96-h LC50 ammonia concentrations at pH 6.53, 7.16, 7.74 and 8.71 were 371, 117, 39.5 and 7.43 mg/l total ammonia-N (NH3-N) and 0.694, 1.00, 1.20 and 1.78 mg/l un-ionized NH3, respectively. The acute toxicity of ammonia in terms of NH3-N was directly related to test pH, and in terms of NH3 was inversely related to pH.