Ability to remove heavy metals by cyanobacterial strains isolated from saline waters of Golestan province

Subject Areas : New Technologies in Aquaculture Development

bahareh nowruzi ¹ ()

Received: 2023-09-03 Accepted : 2023-09-03 Published : 2023-05-22

Keywords: strain, Heavy metal, Keywords: Cyanobacteria,

Abstract :

Abstract[1]Cyanobacteria are found in every ecological environment from saline to dry metal-contaminated environments. Most strains of these bacteria are capable of producing extracellular polymeric materials from natural polysaccharides. Negative Charge of Extracellular Polymeric Materials (EPS) Cyanobacteria are widely used to isolate low-concentration metal cations around the cell. The aim of this study was to compare the ability of twenty-five strains of cyanobacteria to remove heavy metals. The twenty-five strains of cyanobacteria isolated from saline waters of Golestan province were cultured after cultivation and purification, with a concentration of 10 mg / l nickel, copper and chromium Became. After twenty-four hours, the rate of metal removal from the solution was measured with differences in metal concentrations before and after contact with cyanobacterial culture. The results were analyzed using SPSS and mean comparision were prtformed with Tukey test. The results of statistical analysis showed that all twenty-five strains of salinity-resistant cyanobacteria were able to easily remove heavy metals, and this indicates the ability of their environment. However, strain N3 (dry weight 513 mg) belonging to the order Nostocales of heterocystic cyanobacteria, with a significant difference, had the highest ability to remove nickel, chromium and copper metals compared to other strains. The results of this study can be an important step towards the introduction of salinity-resistant cyanobacterial strains in the removal of heavy metals. *- Corresponding authors; [e-mail]