Aix-Marseille Univ, CNRS, LCE, Marseille, France.
Aix-Marseille Univ, CNRS, LCE, Marseille, France.
J Hazard Mater. 2022 Jul 5;433:128729. doi: 10.1016/j.jhazmat.2022.128729. Epub 2022 Apr 1.
In this work, laboratory chamber experiments of gas-phase methyl iodide photolysis in the presence of ozone at three relative humidity conditions were performed to study the formation and physico-chemical properties of iodine oxide particles. The obtained results revealed significant morphological changes of iodine oxide particles that were observed to depend on relative humidity. The formed iodine oxide particles under dry conditions were supposed to be agglomerates of fine hygroscopic crystals. On the other hand, a humid atmosphere was observed to favor the formation of isomeric, tetragonal and orthorhombic hygroscopic crystals potentially composed of HIO likely formed from progressive hydration of iodine oxide clusters. This process leads to a release of molecular iodine, I, which may indicate a potential role of IO in the particles' evolution processes. The obtained results on the iodine oxides' behavior are important to the nuclear power plant safety industry since many of the organic iodides that may be released during a major nuclear power-plant accident contain radioactive isotopes of iodine that are known to have lethal or toxic impacts on human health.
在这项工作中，进行了三种相对湿度条件下臭氧存在下气相甲基碘光解的实验室室实验，以研究碘氧化物颗粒的形成和物理化学性质。所得结果表明碘氧化物颗粒的形态发生了显著变化，据观察，这种变化取决于相对湿度。在干燥条件下形成的碘氧化物颗粒被认为是细吸湿晶体的聚集体。另一方面，观察到潮湿气氛有利于形成同素异形、四方和正交的吸湿晶体，这些晶体可能由 HIO 组成，可能是由碘氧化物簇的逐步水合形成的。这一过程导致释放出分子碘（I），这可能表明 IO 在颗粒演化过程中可能发挥作用。关于碘氧化物行为的研究结果对于核电安全工业非常重要，因为在大型核电厂事故期间可能释放的许多有机碘化物中含有放射性碘同位素，这些同位素已知对人类健康具有致命或有毒影响。
