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Main Title Effects of Water Temperature on the Toxicity of 4-Nitrophenol and 2,4-Dinitrophenol to Developing Rainbow Trout ('Oncorhynchus mykiss').
Author Howe, G. E. ; Marking, L. L. ; Bills, T. D. ; Boogaard, M. A. ; Mayer., F. L. ;
CORP Author Environmental Research Lab., Gulf Breeze, FL. ;National Fisheries Research Center, La Crosse, WI.
Publisher c1994
Year Published 1994
Report Number EPA/600/J-94/128;
Stock Number PB94-158722
Additional Subjects Temperature ; Trout ; Water pollutant effects(Animals) ; Nitrophenols ; Reprint ; Growth ; Toxicity ; Mortality ; Dose-response relationships ; Oncorhynchus mykiss
Library Call Number Additional Info Location Last
NTIS  PB94-158722 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
Early-life-stage (ELS) toxicity tests were conducted to determine the effect of selected water temperatures on the toxicity of 4-nitrophenol and 2,4-dinitrophenol to rainbow trout (Oncorhynchus mykiss). NOECs were determined for growth and mortality at selected time intervals and water temperatures of 7, 12, and 17C. As tests progressed, NOECs leveled to constant time-independent values that were similar for tests at each temperature. In 4-nitrophenol tests, the time-independent NOEC values at 7, 12, and 17C, respectively, were 1.16, 1.20, and 1.16 mg/L for growth and 3.40, 3.38, and 2.20 mg/L for mortality. For 2,4-dinitrophenol, time-independent NOEC values at 7, 12, and 17C, respectively, were 1.07, 0.50, and 0.80 mg/L for growth and 1.30, 1.89, and 1.60 mg/L for mortality. Temperature did, however, affect the rate at which time-independent NOECs were reached. More time was required to reach time-independent NOECs at temperature decreased. For example, the time-independent NOEC in 4-nitrophenol tests at 17C was reached in 14 d, whereas it required 42 d at 7C. The effect of temperature on toxicity must be considered in hazard assessment protocols to assess risk accurately and protect aquatic organisms adequately. Chronic toxicity tests are necessary to assess risk because acute toxicity tests cannot provide the information necessary to predict the long-term effects of factors such as temperature in natural environments.