Effect of Fe~(3+) on Growth of Microcystis aeruginosa

Effect of Fe3+ on growth of Microcystis aeruginosa was investigated by various Fe3+ concentrations in culture media,including 0,10,100,1,000,10,000 and 30,000nmol/L respectively.Biomass,concentration of Chlorophyll a, uptake of N and P by Microcystis aeruginosa during incubation were measured.Superficial structures of Microcystis aeruginosa were also observed under scan electron microscope.Results showed that growth of Microcystis aeruginosa was restrained under lower Fe3+ concentration between 0 to 1,000nmol/L.However,under 30,000nmol/L Fe3+ concentration, growth of Microcystis aeruginosa was accelerated in the first 20days of incubation,following the biomass and concentration of Chlorophyll a represented a fast decrease.Photos of scan electron microscope implied that it may be due to death or autolyzing of algae cells.Results indicated that high Fe3 + concentration could accelerate the deterioration of aqueous environment.