Uptake of technetium by freshwater green microalgae

Geoffrey W. Garnham, Geoffrey A. Codd, Geoffrey M. Gadd (Lead / Corresponding author)

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    16 Citations (Scopus)


    Accumulation of [99Tc]pertechnetate ions (99TcO4-) by the freshwater microalgae Chlorella emersonii, Chlamydomonas reinhardtii and Scenedesmus obliquus has been characterized. In all three species, accumulation consisted of a single rapid energy-independent phase (biosorption), and no energy-dependent accumulation was observed. Biosorption of 99TcOinf4sup-by all three species was concentration dependent, followed a Freundlich adsorption isotherm, and was dependent on pH with increased accumulation by cells with decreasing external pH. Elevated external NaCl concentrations also caused increased accumulation of 99TcOinf4sup-by the cells, as did increased external osmotic potential. Concentrations of K+, Mg2+ and Ca2+ increased accumulation of 99TcOinf4sup-, but concentrations of HCOinf3sup-, SOinf4sup2-and COinf3sup2-decreased 99TcOinf4sup-accumulation by the cells. Most of the 99TcOinf4sup-accumulated by all three species was easily desorbed by 10 m m buffers at various pH values, 0.5 m NaCl, 10 m m Na2CO3 or 10 m m Na2SO4. No differences in the amount of desorption were observed between the various desorption agents used.

    Original languageEnglish
    Pages (from-to)679-684
    Number of pages6
    JournalApplied Microbiology and Biotechnology
    Issue number5
    Publication statusPublished - Aug 1992


    • Microalgae
    • Biosorption
    • Na2SO4
    • Chlorella
    • Chlamydomonas

    ASJC Scopus subject areas

    • Biotechnology
    • Applied Microbiology and Biotechnology


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