An estimation of safe concentrations of fluoride ion for rainbow trout and brown trout
Conference
·
OSTI ID:212034
- C.S.I.C., Madrid (Spain). Centre de Ciencias Medioambientales
Safe concentrations of fluoride ion (F-) for two trout species, Oncorhynchus mykiss Walbaum and Salmo trutta L., were estimated from short-term toxicity bioassays (maximum exposure time of 192 hours) using the multifactor probit analysis (MPA) software on lethal data. The MPA software solves the concentration-time-response equation simultaneously via the iterative reweighed least squares technique (multiple linear regression). A safe concentration (SC) refers to the concentration of toxic substance that can exist in a laboratory environment for an extended exposure time (infinite hours) causing mortality at 0.01% population of test species. Toxicity bioassays were conducted in soft water (average hardness value of 21.8 mg CaCO{sub 3}/L). Test fluoride solutions were made from sodium fluoride (NaF). There was a differential response to fluoride toxicity between test species, O. mykiss appearing to be a more sensitive species. SC values (mg F-/L) and their 95% confidence limits were 5.14 (3.10--7.53) for O. mykiss and 7.49 (4.42--10.96) for S. trutta. These SCs are higher than safe concentrations proposed for freshwater invertebrates. It is concluded that the combination of acute toxicity testing and MPA software may be a valuable methodology in environmental toxicology to estimate accurate safe concentrations of chemical compounds for aquatic organisms. However, this methodology should not be viewed as a perfect alternative to chronic toxicity testing.
- OSTI ID:
- 212034
- Report Number(s):
- CONF-9511137--; ISBN 1-880611-03-1
- Country of Publication:
- United States
- Language:
- English
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