(CoCl ). An accurately weighed 250 mg portion of biomass was
added to each flask and the mixtures were agitated on a rotary shaker at 180 rpm for different time intervals, 30, 60, 90 and 120 min. Controls for each concentration without addition of heavy metals were also maintained. After the respective agitation period, the solutions were separated from the biomass by filtration and subjected to further analysis. All the biosorption experiments were conducted in triplicates to substantiate the results. The data shown are the mean values of three replicate determinations.