Howe, G. E., Marking, L. L., Bills, T. D., Boogaard, M. A., and Mayer, F. L. Jr.,
1994, Effects of water temperature on the toxicity of 4-nitrophenol and
2,4-dinitrophenol to developing rainbow trout (Oncorhynchus mykiss):
Environmental Toxicology and Chemistry, v. 13, no. 1, p. 79-84.

Abstract

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 17 degree
C. 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 17 degree C, 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 17 degree C,
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 as temperature decreased. For example, the
time-independent NOEC in 4-nitrophenol tests at 17 degree C was reached in 14 d,
whereas it required 42 d at 7 degree C.

Keywords

p-nitrophenol, 2,4-dinitrophenol, toxicity-, temperature-, Oncorhynchus-mykiss,
water-temperature, toxicity-testing, temperature-effects, toxicity-tests, phenols-,
freshwater-fish, juveniles-