مرکز منطقه ای اطلاع رساني علوم و فناوري -

چكيده لاتين :

Spirulina platensis, a cyanobacterium of economic important was studied for the toleran ce to cad mium. The bioassay studies showed the ECso value to be 1.53 mg/g. Th e cyanobacterium was very sensitive to low metal concentration and the productivi ty was also reduced. The chlorophyll pigments reduced with decreasing the algal biomass. The algal survival rate showed a marked red uction in their survival rate from 98% in the control medium to >50% at 1.6 mg/L cadmium and no growth in the culture exposed to cadmium concentration of 1.9 mgIL. TheBiosorption studies showed that the algae had a great potential for adsorbing the hea vy metal on to the cell. A max imum uptake of 44.56 mg/g was obtained in living cells ofSpirulina platensis suggest ing the possibility of the algae to bea good biosorbent. Culturing the algae in lowmetal concentrations can beutilized as potential tertiary treatment for metal containing effluent. The immobilized cell ofSpirulina platensis was able to bemore effective in absorbing the metal 47.89 mg/g to the cel l. Th e re sults of the study indicate the potentiality ofthe algae to be a possible agent for removal of heavy metals from aqu eous solutions.