The toxicity of chlorine to a common vascular aquatic plant |
| |
Authors: | Charles H Watkins Richard S Hammerschlag |
| |
Affiliation: | Ecological Services Laboratory, National Capital Region. National Park Service, Washington, DC 20242, U.S.A. |
| |
Abstract: | Myriophyllum spicatum was exposed to various chlorine concentrations on a continuous and intermittent basis in 96-h toxicity studies utilizing a proportional diluter. Continuous exposure to chlorine concentrations as low as 0.05 mg l−1 total residual chlorine (TRC) depressed shoot and total plant dry weights approx. 30% relative to controls. Shoot length was depressed approx. 16% at this concentration. Chlorophyll a was depressed 25% at 0.1 mg l−1 TRC. However, intermittent exposure of plants to chlorine for three 2-h periods daily for 96 h indicated an insensitivity to repeated short term chlorine exposure at all concentrations but 1.0 mg l−1 TRC. These results indicate that high level chlorine discharges from waste water facilities and electric generating plants could be a contributing factor impacting nearby submerged aquatic vegetation. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |