1. 9) U.S. EPA : Toxicity Identification Evaluation: Characterization of Chronically Toxic Effluents, Phase I, EPA/600/6-91/005F, 1992.
2. 13) OECD : Daphnia magna Reproduction Test No. 211, 2008.
3. 16) Johnson, C. G. : Effects of pH and hardness on acute and chronic toxicity of un-ionized ammonia to Ceriodaphnia dubia, M.S. Thesis, University of Wisconsin, Stevens Point, WI, 1995.
4. 18) U.S. EPA : 1999 Update of Ambient Water Quality Criteria For Ammonia (EPA-822-R-99-014), p. 34, 1999.
5. 19) Belanger, S. E , Farris, J. L. and Cherry, D. S. : Effects of diet, water hardness, and population source on acute and chronic copper toxicity to Ceriodaphnia dubia, Archives of Environmental Contamination and Toxicology, Vol. 18, No. 4, pp. 601-611, 1989.