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Updated: Oct 17, 2025
10:14
Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography
Published on: May 16, 2014
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Interaction process between gaseous CH3I and NaCl particles: implication for iodine dispersion in the atmosphere
Hanaa Houjeij1,2, Anne-Cécile Gregoire2, Gwenaëlle Le Bourdon1
1Institut des Sciences Moléculaires, Université de Bordeaux, UMR CNRS 5255, Talence Cedex 33405, France. sophie.sobanska@u-bordeaux.fr.
Environmental Science. Processes & Impacts
|October 6, 2021
Summary
Gaseous iodomethane (CH3I) weakly adsorbs onto sodium chloride (NaCl) aerosols, indicating a low probability of uptake. This finding is crucial for understanding atmospheric iodine chemistry and the dispersion of radioactive CH3I.
Area of Science:
- Atmospheric chemistry
- Environmental science
- Nuclear safety
Background:
- Gaseous iodomethane (CH3I) is released by ocean biological activity and nuclear power plant accidents.
- Understanding CH3I atmospheric behavior is vital for ozone cycle and radioactive iodine dispersion.
- Radioactive iodine release poses environmental and human health risks.
Purpose of the Study:
- To investigate the interaction between gaseous iodomethane (CH3I) and sodium chloride (NaCl) aerosols.
- To determine the adsorption kinetics and uptake coefficient of CH3I on NaCl particles.
- To assess the role of halide-containing aerosols in CH3I atmospheric transport.
Main Methods:
- Diffuse Reflectance Fourier Transform Spectroscopy (DRIFTS) was used to study CH3I adsorption on NaCl.
- Experiments were conducted under ambient air conditions.
- Adsorption kinetics and desorption were analyzed.
Main Results:
- CH3I was observed to adsorb onto the NaCl particle surface.
- A significant portion of CH3I (1.68 ± 0.85 × 10^14 molecule/mgNaCl) strongly bonded to NaCl, with no desorption observed.
- CH3I adsorption followed 1st order kinetics, with an uptake coefficient on the order of 10^-11.
Conclusions:
- CH3I exhibits a low probability of being taken up by halide-containing aerosols like NaCl.
- These findings contribute to refining atmospheric iodine chemical models.
- The study provides essential data for assessing the environmental and radiological impact of CH3I releases.
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