Enzymatically controlled iodination reactions in the terrestrial environment

J.V. Christiansen, L. Carlsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Huhiic acids are iodinated either by elemental iodine/ hypoiodous acid or by iodide in the presence of enzymes of the peroxidase group and hydrogen peroxide. The resulting iodinated humic acids show a uniform distribution of the iodine independent of the single molecular weight fractions. It is demonstrated that the enzymatically controlled iodination reactions can be rationalized as applying to a rather simple equilibrium model taking only the concentrations of the sites available for iodination and the initial iodide concentrations into account together with the concentration of the iodinated sites. Deiodination experiments suggest that three different types of sites available for iodination are present, distinguishable due to the deiodination mechanisms. The possible influence of the findings on the migration behaviour of radioiodide in the terrestrial environment is discussed.
    Original languageEnglish
    JournalRadiochimica Acta
    Volume52-53
    Issue number2
    Pages (from-to)327-334
    ISSN0033-8230
    DOIs
    Publication statusPublished - 1991

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