Record Display for the EPA National Library Catalog


Main Title Biological Productivity of the Coeur D 'Alene River as Related to Water Quality.
Author Rab, F. W. ; Sappingto, C. W. ;
CORP Author Idaho Univ., Moscow. Water Resources Research Inst.
Year Published 1970
Report Number OWRR-A-024-IDA; 04939,; A-024-IDA(1)
Stock Number PB-197 736
Additional Subjects ( Biological productivity ; Water quality) ; ( Zinc ; Toxicity) ; ( Water pollution ; Zinc) ; ( Fishes ; Water pollution) ; Bioassay ; Trout ; Tolerances(Physiology) ; Ions ; Lethal dosage ; Water chemistry ; Ecology ; Limnology ; Coeur d'Alene River ; Water pollution effects(Animals) ; Salmo clarki
Library Call Number Additional Info Location Last
NTIS  PB-197 736 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 22p
Determinations of the acute toxicity of zinc to Cutthroat trout (Salmo clarki) fingerlings were conducted using two bioassay systems. Methyl orange alkalinity of the test water was 23.9 ppm as calcium carbonate. PH values were near neutrality. In a standard, static bioassay, 24, 48 and 96 hr median tolerance limit (TLm) values of 0.62, 0.27 and 0.09 ppm zinc respectively, were obtained. Results of a recirculating, flowing-water bioassay showed a 24 hr TLm value of 0.42 ppm zinc. No 48 or 96 hr values were found due to statistical non-significance of the data. The inconclusiveness of the results of the running system may be due to changes in the concentration of zinc present in the test water as a result of sorption of the zinc ions to the bottom and sides of the test tank. (Author)