Accumulation of technetium by cyanobacteria

Geoffrey W. Garnham, Geoffrey A. Codd, Geoffrey M. Gadd

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    11 Citations (Scopus)


    Accumulation of pertechnetate ions (99TcO4-) by the cyanobacterial species Synechocystis PCC 6803, Synechococcus PCC 6301, Plectonema boryanum, Anabaena variabilis and a red Oscillatoria 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 in A. variabilis, P. boryanum and the red Oscillatoria 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 in Synechococcus PCC 6301 and Ca2+ increased accumulation by the red Oscillatoria. Some anions decreased TcO4- accumulation; CO32- in A. variabilis and the red Oscillatoria, SO42- in Synechocystis PCC 6803, and HCO3- in P. 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.

    Original languageEnglish
    Pages (from-to)307-315
    Number of pages9
    JournalJournal of Applied Phycology
    Issue number3
    Publication statusPublished - Jun 1993


    • anions
    • biosorption
    • cations
    • cyanobacteria
    • pertechnetate
    • pH

    ASJC Scopus subject areas

    • Aquatic Science
    • Plant Science


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