The relationship between chronic values in toxicity tests with Ceriodaphnia dubia
- Columbus State Univ., GA (United States). Biology Dept.
- Univ. of Kentucky, Lexington, KY (United States)
Chronic toxicity tests using Ceriodaphnia dubia are conducted across the United States by facilities releasing wastewaters into bodies of freshwater, as well as by the appropriate agencies governing environmental protection. Until recently, the chronic values used for decision making were the No Observable Effect Concentration (NOEC), the Lowest Observable Effect Concentration (LOEC) and the Chronic Value (ChV). Currently, Inhibition Concentrations of a Given Percent (IC{sub p}) are being considered, for effluent permitting, by a number of states. The IC{sub p} value is the concentration at which the reproduction of C. dubia is inhibited by p percent. It has been asserted that the IC{sub 25} is approximately equivalent to the NOEC and that the IC{sub 50} is similar to the ChV. Using data collected in a series of chronic toxicity tests, these values were compared. The results came from 3-brood Ceriodaphnia Survival and Reproduction tests that had been performed with 10 different metal cations.
- OSTI ID:
- 516809
- Report Number(s):
- CONF-9604217-; ISBN 0-8031-2474-0; TRN: IM9738%%119
- Resource Relation:
- Conference: 6. Environmental toxicology and risk assessment: modeling and risk assessment, Orlando, FL (United States), 15-18 Apr 1996; Other Information: PBD: 1997; Related Information: Is Part Of Environmental toxicology and risk assessment: Modeling and risk assessment (sixth volume); Dwyer, F.J.; Doane, T.R.; Hinman, M.L. [eds.]; PB: [570] p.; ASTM STP 1317
- Country of Publication:
- United States
- Language:
- English
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