Entangled iodine and hydrogen peroxide formation in ice

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 isThis 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

Entangled iodine and hydrogen peroxide formation in ice

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 O(2)in acidic icy water, which produces both I as well as O2H radicals. I recombines with I(-)to produce I(2)(-)at a diffusion-limited rate, followed by formation of I(3)(-)through disproportionation, while O2H yields H(2)O(2)with I(-)and a proton dissolved in icy water.11Nsciescopu