科研之友
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摘要
Acute toxicity of copper (Cu) on Chironomus ramosus was determined by exposing third-instar larvae to graded concentrations of copper sulphate (CuSO4 center dot 5H(2)O). Median lethal concentrations (LC50) of Cu as CuSO4 at 24, 48, 72 and 96 hr were determined as 3280, 1073.33, 780 and 183 mu g l(-1), respectively. For determining the effects of chronic toxicity, small first-instar larvae were individually exposed to sublethal concentrations of copper sulphate (1.0-18.0 mu g l(-1)) for a period of 21 days. Discoloration and thinning of body were detected at 1 mu g l(-1) and ventilation movements, pupation and adult emergence were significantly affected at 1.8 mu g l(-1). At 10 mu g l(-1) CuSO4 concentration, growth and tube-building activities of the larva were significantly different from the control.
- 出版日期2012-1
