Entangled iodine and hydrogen peroxide formation in ice

• Published in: Physical Chemistry Chemical Physics
• Main Authors: Baek, Y.S., Kim, K., Saiz-Lopez, A., Min, D.W., Kim, B., Choi, W., Choi, C.H.
• Other Authors: Korea Polar Research Institute, European Commission
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Royal Society of Chemistry (UK) 2020
• Subjects: ice core; Korea Polar Research Institute
• Online Access: http://hdl.handle.net/10261/228859; https://doi.org/10.1039/d0cp02966a; https://doi.org/10.13039/501100000780

4 pags., 3 figs. Ice-core records show that anthropogenic pollution has increased the global atmospheric concentrations of hydrogen peroxide and iodine since the mid-20th century. Here, for the first time, we demonstrate a highly efficient mechanism that synergistically produces them in icy water conditions. This reaction is aided by a key intermediate IO2H, formed by an I- ion with a dissolved O2 in acidic icy water, which produces both I as well as O2H radicals. I recombines with I- to produce I2- at a diffusion-limited rate, followed by formation of I3- through disproportionation, while O2H yields H2O2 with I- and a proton dissolved in icy water. This journal is This work was supported by the Korea Polar Research Institute (KOPRI, PE20030). ASL acknowledges financial support from the European Research Council Executive Agency under the European Union’s Horizon 2020 Research and Innovation programme (Project ERC-2016-COG 726349 CLIMAHAL)