Abstract
In order to provide information for biological monitoring of environmental pollution and help people to develop pharmaceutical wastewater pollutant monitoring and emission standard, in this paper, acute toxicity experiments of three heavy metal pollutants, Zn2+,Cd2+ and Hg2+ existed usually in pharmaceutical wastewater, were done and their 24hr LC50 on the Paramecium were got individually, safety thresholds were calculated. At the same time, impact of different concentration heavy metal ions on population growth curve of Paramecium caudatum were researched. Results indicated that the acute toxicity of Hg2+ are the strongest, and the population growth curve changed significantly by three different types under three heavy metal ions pressure.
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