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Zn2+ Biosorption Efficiency of a Nostoc sp. Isolated From a Coal Mine in Sohra, Meghalaya

Omega L. Diengdoh, Susan M. Warjri, Mayashree B. Syiem

Abstract


A Nostoc isolate obtained from a coal mine at Sohra in Meghalaya was evaluated for biosorption potential for Zn2+ which was one of the metal ions besides Cu2+, Cd2+, Fe3+, Mn2+ and Pb2+ found in water samples collected from the site. Zn2+ uptake potential of the cyanobacterium was analyzed calculating amount of ions removed by the isolate from Zn2+ supplemented media using atomic absorption spectroscopy (AAS). The organism recorded a highest removal of 73% of Zn from media supplemented with 50 μM Zn after 24 h exposure. The best metal removal potential was recorded for 10-day old cultures. Metal distribution studies showed that major share (80%) of the metal ions removed were adsorbed on the cell surface of the organism. 12% of metal ions was internally accumulated. That the metal uptake is an energy dependent process was proved from the fact that cultures exposed to continuous light for 24 h were able to remove 73% of zinc from the medium containing the metal ion. In contrast, same experiment conducted in dark recorded only 29% zinc removal within the same period. Cultures treated with the photosynthetic inhibitor, DCMU also recorded similar amount (29%) of zinc removal from the medium. However, cells kept in dark with exogenously supplied 10 μM ATP (adenosine triphosphate) could remove 69% zinc within the same experimental time providing evidence that energy in the form of ATP is essential for metal uptake. All in all, the Nostoc isolate showed significant metal uptake ability and could be a potential candidate in programmes engaged for the bioremediation of heavy metals.

Keywords


AAS, cyanobacterium, Nostoc isolate, Zn2+ uptake potential

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References


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DOI: https://doi.org/10.37628/jibb.v1i2.39

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