Bi D-S;Qian C-L

Shanghai Institute of Application Technology; Shanghai 200235; [mailto:bidongsu@126.com];College of Civil Construction and Safety Engineering

Bioindicators;Bioremediation;Growth;Bioindicators;Bioremediation;Growth;Synergism;Toxicity;eutrophic water;heavy metals

[Objective] The toxicity effect of Hg super(2+) and Cr(VI) on alga growth in eutrophic water was studied to provide reference for biomonitoring and bioremediation of eutrophic water. [Method] The mother liquid of alga, which was separated from the eutrophic water, were put into the solutions of Hg super(2+) and Cr(VI) with different concentrations and their mixture solution, respectively. And the toxicity effect of Hg super(2+) and Cr(VI) on the growth and propagation of alga in eutrophic water was observed. [Result] The alga in eutrophic water performed rather sensitive to Cr(VI) and when its concentration was o-ver 1 mg/L, threre was obvious effect on alga growth. The alga was not very sensitive to Hg super(2+) when its concentration was lower, but its toxicity became stronger and stronger when its concentration increased to some extent and the toxicity effect of Cr(VI) on alga growth was just on the contrary. When the ion concentration was lower than 10 mg/L, the toxicity of Hg super(2+) on alga was lower than that of Cr(VI). When the concentration was over 10 mg/L, the toxicity of Hg super(2+) exceeded that of Cr(VI). The toxicity of ion mixture solution of Hg super(2+) and Cr(VI) had synergism inhibition on alga, which could be performed only when the concentration was over 4 mg/L. [Conclusion] The toxicity of heavy metal on alga not only related to the alga cell, but also related to the concentration of heavy metal ion.