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Poster Presentations
Day 3, June 24（Tue.）
Room P (Maesato East, Foyer, Ocean Wing)
- 3P-AM-01
Capture of Hydroxyl Radicals by Hydronium Cations and the Spontaneous Oxidation of I- in Water Microdroplets
(Nankai Univ.)
oDong Xing, Xinxing Zhang
In recent years, with the deepening understanding of microdroplet chemistry, it has emerged as a prominent and highly active research field. Within microdroplets, certain reactions can be accelerated by orders of magnitude, and reactions that were previously unattainable in bulk phase become feasible. Several researchers have proposed that microdroplets at the gas-liquid interface exhibit extremely high electric fields, reaching up to 109 V/m. These electric fields have the ability to dissociate hydroxide ions, generating hydroxyl radicals (•OH) and free electrons. In this research, employing sheath gas spray, water microdroplets were generated, and the hydroxyl radicals (OH•--H3O+) bound to hydrated cations were directly observed in mass spectrometry. Additionally, hydroxyl radicals were captured using two common scavengers, caffeine and melatonin. Subsequent investigations demonstrated the spontaneous and ultrafast oxidation of I- to I2- and I3- within microdroplets, harnessing the oxidative capability of hydroxyl radicals spontaneously generated within the microdroplets. This study further proposed a previously unknown source of I- and I2- in the atmosphere, potentially originating from microdroplets formed by aerosol emissions over the ocean surface or within clouds.