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<p>The concentrations of CH<sub>3</sub>I produced by gamma irradiation of mixed solutions containing 2&#xa0;mM NaI and 5&#xa0;mM methyl ethyl ketone (MEK) were measured under acidic, neutral, and alkaline conditions as a function of absorbed dose. Simultaneously, the concentrations of I<sub>2</sub> formed in the solutions and the changes in pH before and after irradiation were also determined. Under acidic conditions, I<sub>2</sub> formation was predominant, resulting in an increase in pH after irradiation. In this case, CH<sub>3</sub>I formation appeared to be governed by the generation of ⋅CH<sub>3</sub> radicals. Under neutral conditions, MEK decomposition was dominant, leading to a decrease in pH after irradiation and yielding relatively high amounts of CH<sub>3</sub>I. Under alkaline conditions, a slight decrease in pH was observed after irradiation, which was primarily attributed to MEK decomposition. Moreover, neither I<sub>2</sub> nor CH<sub>3</sub>I were detected under alkaline conditions, suggesting that I<sub>2</sub> is an essential species for CH<sub>3</sub>I formation under these experimental conditions.</p>

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Effect of absorbed dose and pH on methyl iodide formation in 2 mM NaI and 5 mM MEK solutions

  • 期刊论文

  • 发表日期：

    2026年1月2日

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  • Jei-Won Yeon,
  • Minsik Kim

摘要

The concentrations of CH3I produced by gamma irradiation of mixed solutions containing 2 mM NaI and 5 mM methyl ethyl ketone (MEK) were measured under acidic, neutral, and alkaline conditions as a function of absorbed dose. Simultaneously, the concentrations of I2 formed in the solutions and the changes in pH before and after irradiation were also determined. Under acidic conditions, I2 formation was predominant, resulting in an increase in pH after irradiation. In this case, CH3I formation appeared to be governed by the generation of ⋅CH3 radicals. Under neutral conditions, MEK decomposition was dominant, leading to a decrease in pH after irradiation and yielding relatively high amounts of CH3I. Under alkaline conditions, a slight decrease in pH was observed after irradiation, which was primarily attributed to MEK decomposition. Moreover, neither I2 nor CH3I were detected under alkaline conditions, suggesting that I2 is an essential species for CH3I formation under these experimental conditions.