Iodination of humic acid samples from different origins

Pascal E. Reiller (1) , Florence F. Mercier-Bion (2, 1) , N. Gimenez (2) , N. Barré (2) , F. Miserque (3)

1 LSRM - Laboratoire de Spéciation des Radionucléides et des Molécules
2 LAMBE - Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement
3 LRSI - Laboratoire de Réactivité des Surfaces et des Interfaces

The iodination of Gorleben and synthetic humic substances (HS) was studied complementarily by UV-Visible and X-ray Photoelectron Spectroscopy (XPS). The I₂(aq) consumption kinetics could neither be linearly correlated to [H⁺] nor to HS concentration as already observed in the literature. Nevertheless, the electrophilic substitution mechanism was further evidenced by a production of both I₃^- and I^-, leading to a covalent bonding. The XPS analysis of the iodinated samples confirmed the covalent bonding between iodine and carbon of HS for all the samples.

Keywords: humic acid; iodine; iodination; kinetics; aromaticity; UV-visible; XPS

Domains: Inorganic chemistry

Pascal E. Reiller, Florence F. Mercier-Bion, N. Gimenez, N. Barré, F. Miserque. Iodination of humic acid samples from different origins. Radiochimica Acta, 2006, 94 (9-11), pp.739-745. ⟨10.1524/ract.2006.94.9-11.739⟩. ⟨cea-00288427⟩