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Formation of iodinated organic compounds by oxidation of iodide-containing waters with manganese dioxide.

Abstract : This study shows that iodinated organic compounds can be produced when iodide-containing waters are in contact with manganese oxide birnessite (delta-MnO2) in the pH range of 5-7. In the absence of natural organic matter (NOM), iodide is oxidized to iodate that is also adsorbed onto delta-MnO2. In the presence of iodide and NOM, adsordable organic iodine compounds (AOI) are formed at pH < 7 because of the oxidation of iodide to iodine by delta-MnO2 and the reactions of iodine with NOM. In addition, iodoacetic acid and iodoform have been identified as specific iodinated byproducts. Formation of iodoform is not observed for high NOM/delta-MnO2 ratios due to inhibition of the catalytic effect of delta-MnO2 by NOM poisoning. Experiments with model compounds such as resorcinol and 3,5-heptanedione confirmed that the delta-MnO2/l(-) system is very effective for the formation of iodinated organic compounds. These results suggest that birnessite acts as a catalyst through the oxidation of iodide to iodine and the polarization of the iodine molecule, which then reacts with NOM moieties. Furthermore, our results indicate that during water treatment in the presence of manganese oxide, iodinated organic compounds may be formed, which may lead to taste and odor or toxicological problems.
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Contributeur : Françoise Merigaud Connectez-vous pour contacter le contributeur
Soumis le : lundi 19 décembre 2011 - 18:00:10
Dernière modification le : mercredi 10 novembre 2021 - 16:46:22


  • HAL Id : hal-00653608, version 1
  • PUBMED : 19806734



H. Gallard, S. Allard, Rudy Nicolau, Urs von Gunten, J.P. Croué. Formation of iodinated organic compounds by oxidation of iodide-containing waters with manganese dioxide.. Environmental Science and Technology, American Chemical Society, 2009, 43 (18), pp.7003-9. ⟨hal-00653608⟩



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