Effect of water pH on the toxicity of 2,4,5-trichlorophenol to four species of freshwater animals
- Univ. of Wisconsin, Superior, WI (United States)
- Environmental Protection Agency, Duluth, MN (United States). Environmental Research Lab.
2,4,5-Trichlorophenol (TCP) is a weak acid with a pH of approximately 7.2 which is expected to have a significant effect upon its toxicity. Lumbriculus variegatus, Oncorhynchus mykiss, Pimephales promelas, and Hyalella azteca were exposed to TCP in 96 h flow-through toxicity tests. For the first two species, simultaneous tests were conducted at three pH values (7.0, 7.8, 8.6). The other two species were tested at six pH values conducted in two sets of three simultaneous tests (6.2, 7.4, 8.6 and 6.8, 8.0, 9.2). All species tested showed decreased sensitivity to TCP with increased pH of the water. Over the pH range tested, LC50s for L. variegatus varied by about 5-fold, for P. promelas by 12-fold, for H. azteca by 10-fold, and for O. mykiss by 1.5-fold. The effects of pH on TCP toxicity to P. promelas was also tested in 30 day chronic tests at pH 7.0, 7.8 and 8.6. Survival in these tests was affected by pH similarly to the acute tests. Growth also was less severely affected at higher pH.
- OSTI ID:
- 37382
- Report Number(s):
- CONF-9410273--
- Country of Publication:
- United States
- Language:
- English
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