Effect of pH on toxicity of kraft pulp and paper mill effluent to salmonid fish in fresh and seawater |
| |
Authors: | DJ McLeay CC Walden JR Munro |
| |
Affiliation: | Division of Applied Biology, B.C. Research, Vancouver, V6S 2L2, Canada |
| |
Abstract: | In freshwater bioassays with juvenile rainbow trout (Salmo gairdneri), at initial pH values from 4 to 11, kraft mill effluents were considerably less toxic at pH 9–10 than at neutrality. When pH of test solutions was controlled throughout the bioassay period, the least toxic range was 8.5–9.5. Toxicity at typical receiving-water pH values was 50–67% greater.The acute toxicity of effluent samples to yearling coho salmon (Oncorhynchus kisutch) was identical for these effluents in seawater and freshwater respectively, provided that the pH was adjusted and held at the same value, and that test fish were previously acclimated to the dilution water for several months. Thus seawater constituents other than pH did not affect the acute toxicity of pulp and paper mill effluents appreciably. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|