Influence of Organic Matter in the Prediction of Iodine Migration in Natural Environment

Pascal E. Reiller (1) , Valérie Moulin

1 LSRM - Laboratoire de Spéciation des Radionucléides et des Molécules

Halogenation of phenolic moieties is one of the most important reactions between humic substances (HS) and iodine or chlorine. These reactions were studied in order to assess the importance of these interactions with reduced (I–) and oxidised (I2) form of iodine. I– was fixed by the addition of Na2S2O3. After separation of HS and I– by ultrafiltration, no significant uptake was evidenced in the time framework of this study. The consumption of I2(aq) by HS was followed by the decay of I3– absorbance (351 nm). It comes out that (i) when I– is fixed by Na2S2O3, no interaction with HS could be quantified; (ii) I2(aq) does react with HS but the kinetics cannot be linearalised. This study confirms the significance of iodine-organic matter interactions as a governing process for iodine migration in surface environment. More studies are on going to develop predictive models of iodination kinetics.

Domains: Inorganic chemistry

Pascal E. Reiller, Valérie Moulin. Influence of Organic Matter in the Prediction of Iodine Migration in Natural Environment. Material Research Society Fall Meeting 2002, 2002, United States. pp.565-570. ⟨cea-00474323⟩