Accumulation of technetium by cyanobacteria |
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Authors: | Geoffrey W Garnham Geoffrey A Codd Geoffrey M Gadd |
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Institution: | (1) Department of Biological Sciences, University of Dundee, Dundee, DD1 4HN, UK |
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Abstract: | Accumulation of pertechnetate ions (99TcO4
–) by the cyanobacterial speciesSynechocystis PCC 6803,Synechococcus PCC 6301,Plectonema boryanum,Anabaena variabilis and a redOscillatoria sp. consisted solely of a single rapid energy-independent phase (biosorption); no energy-dependent uptake was detected. Biosorption of TcO4
– was concentration-dependent and could be described by a Freundlich adsorption isotherm for each cyanobacterial species examined. Decreasing pH increased the accumulation of TcO4
– by all the species as did an increase in external NaCl concentration. Accumulation of TcO4
– was also increased inA. variabilis, P. boryanum and the redOscillatoria by an increased external osmotic potential. Concentrations of cations affected TcO4
– accumulation; K+ increased accumulation in all the species, Mg2+, Ca2+, Sr2+ and Cs+ increased accumulation inSynechococcus PCC 6301 and Ca2+ increased accumulation by the redOscillatoria. Some anions decreased TcO4
– accumulation; CO3
2– inA. variabilis and the redOscillatoria, SO4
2– inSynechocystis PCC 6803, and HCO3
– inP. boryanum. The majority of TcO4
– accumulated by all the cyanobacteria was easily desorbed, with no difference in the amounts desorbed between desorption agents of different pH or cation concentration.(*author for correspondence) |
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Keywords: | cyanobacteria pertechnetate biosorption pH cations anions |
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