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Research

Theses in progress

Experimental study on the Capture/Desorption of gaseous iodine (I2, CH3I) on environmental aerosols


Hanaa Houjeij will defend her thesis

on Friday 13th November 2020 at 10:00 am

At Cadarache castle, ​concil room

13115 Saint-Paul-lez-Durance

France


Ju​ry

S. Sobanska, University of Bordeaux - Institut des Sciences Moléculaires (ISM), Thesis Director
A.-C. Grégoire , IRSN PSN-RES/SEREX/L2EC, Co-supervisor IRSN
Pr H. Wortham University of Aix Marseille - Laboratory of Environmental Chemistry (LCE), Reporters
Pr C. Toubin University of Lille - Laboratory of Physics of Lasers, Atoms and Molecules (PhLAm), Reporters
Masson Olivier, IRSN- PSE-ENV/SEREN/LEREN, Examiners
Mascetti Joëlle, University of Bordeaux - Institut des Sciences Moléculaires (ISM), Examiners
Florent Louis , University of Lille - Laboratory of Physical Chemistry of Combustion Processes and Atmosphere (PC2A), Examiners
Pr E. Villenave, University of Bordeaux, Environment and Paleoenvironment Oceanic and Continental (EPOC), Examiners
S. Coussan, University of Aix Marseille, Laboratory of Physics of Ionic and Molecular Interactions (PIIM), Invited member


Abstract

Iodine is emitted into the atmosphere either by biological activity in the oceans or more specifically, for radioactive iodine, during a severe nuclear accident. Improving the modelling of the transport/reactivity of these so-called halogenated compounds in the atmosphere is important since they are strongly linked to the cycle of ozone formation/depletion and since the dispersion of radioactive iodine may have radiological consequences. In this context, the interactions between a gaseous organic iodine compound and water or atmospheric aerosols, such as sea salts, was studied by using spectroscopic approach.


We have shown very weak interactions with sea salt atmospheric aerosols. With water, it forms aggregates interacting with water polymers rather than forming new compounds. At atmospheric temperatures, adsorption of this gaseous organic iodine compound on amorphous ice is unlikely to occur. These results will allow the implementation of knowledge on iodine fate in the atmosphere.​



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