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Heavy metal is a main pollutant in the marine ecosystem . so study on the effect of heavy metal on phytoplankton is important . Algae (Chaetoceros sp . , Dunaliella sp . ., Dicrateria zhanjiangenis Hu . var . sp .) were laboratory cultured to observe the effect of heavy metals on their growth . The effect of different metal ion concentration , the detoxication effect of complexation agents and the growth of algae in different media and different nutrition levels were studied to evaluate the effect of metal speciation . It is proved that trace amount of heavy metals can stimulate the growth of algae cells but that high concentration is lethal . The sequence of toxicity is Cd2+>Zn2+>Pb2+ . In ordinary nutrition conditions , the detoxication sequence of complexation agents to Chaetoceros sp . is EDTA > sodium salicylate > sodium oxalate > sodium citrate > sulfanilic acid > O-phenanthroline . This is in good conformity with the stability constant sequence of these agents with copper and good evidence that t
A study of the effect of heavy metal on phytoplankton is important. Algae (Chaetoceros sp., Dunaliella sp., Dicrateria zhanjiangenis Hu. Var. Sp.) Were laboratory cultured to observe the effect of heavy metals on their growth. The effect of different metal ion concentration, the detoxication effect of complexation agents and the growth of algae in different media and different nutrition levels were studied to evaluate the effect of metal speciation. It is proved that trace amount of heavy metals can stimulate the growth of algae cells but that high concentration is lethal. The sequence of toxicity is Cd 2+> Zn 2+ + Pb 2+. In ordinary nutrition conditions, the detoxication sequence of complexation agents to Chaetoceros sp. is EDTA> sodium salicylate> sodium oxalate> sodium citrate> sulfanilic acid> O-phenanthroline. This is in good conformity with the stability constant sequence of these agents with copper and go od evidence that t