Toxicity of 30-Minute Exposures of Residual Chlorine to the Copepods Limnocalanus macrurus and Cyclops bicuspidatus thomasi
- 1 December 1975
- journal article
- research article
- Published by Canadian Science Publishing in Journal of the Fisheries Research Board of Canada
- Vol. 32 (12) , 2495-2501
- https://doi.org/10.1139/f75-287
Abstract
The intermittent chlorination of power plant cooling waters often results in the appearance of residual C in the receiving waters. Laboratory bioassays were conducted at 5, 10, 15 and 20.degree. C to determine the toxicity of residual C exposures of 30 min to the copepods L. macrurus and C. b. thomasi. The 30-min TL-50 [LD 50 (?)] was 1.54 mg/l for L. macrurus at both 5 and 10.degree. C. For C. b. thomasi, the 30-min TL-50 values for exposures at chlorine causing 5% mortality (30-min TL-5) were used to predict safe levels for 30-min exposures. The predicted safe concentrations were 0.9 mg/l for L. macrurus and 0.5 mg/l for C. b. thomasi. These concentrations roughly coincide with the maximal C levels characteristic of most power plant effluents.This publication has 0 references indexed in Scilit: