Comparison of the metal removal capability of somecyanobacterial strains separated from the salt waters of Golestan province

Background and Aim : Cyanobacteria are find in any ecological environment, from salt water to dry metal-contaminated environments. The negative charge of extracellular polymeric materials (EPS) of Cyanobacteria is widely used to isolate low-concentration metal cations in the cell environment. The aim of this study was to compare the ability of some cyanobacterial strains to remove heavy metals.Methods : Twenty-five cyanobacteria isolated from salt waters of Golestan province were cultivated with a concentration of ۱۰ mg/l nickel, copper and chromium cultivation. After twenty-four hours, the amount of metal removed from the solution was measured. Analysis of the results of three replications was performed using SPSS and Excel software.Results : The results of statistical analysis showed that all twenty-five salinity-resistant cyanobacteria were easily able to remove heavy metals, which is an indication of the ability of their habitat. However, strain N۳ (dry weight ۵۱۳ mg), which belongs to the order Nostocales had a significant difference in the ability to remove nickel, chromium and copper metals compared to other strains.Conclusion : The results of this study could be an important step in introducing salt-resistant Cyanobacterial strains in the removal of heavy metals.

کلیدواژه ها:

Cyanobacteria ، removal of heavy metals