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Hydrogen peroxide (HOOH) is a significant oxidant in atmospheric condensedphases (e.g., cloud and fog drops, aqueous particles, and snow) that alsophotolyzes to form hydroxyl radical (•OH). •OH can react with organics inaqueous phases to form organic peroxyl radicals and ultimately reform HOOH,but the efficiency of this process in atmospheric aqueous phases, as well assnow and ice, is not well understood. We investigate HOOH formation from •OHattack on 10 environmentally relevant organic compounds: formaldehyde,formate, glycine, phenylalanine, benzoic acid, octanol, octanal, octanoicacid, octanedioic acid, and 2-butoxyethanol. Liquid and ice samples with andwithout nitrate (as an •OH source) were illuminated using simulated solarlight, and HOOH formation rates were measured as a function of pH andtemperature. For most compounds, the formation rate of HOOH without nitratewas the same as the background formation rate in blank water (i.e.,illumination of the organic species does not produce HOOH directly), whileformation rates with nitrate were greater than the water control (i.e.,reaction of •OH with the organic species forms HOOH). Yields of HOOH, definedas the rate of HOOH production divided by the rate of •OH production, rangedfrom essentially zero (glycine) to 0.24 (octanal), with an average of 0.12 ± 0.05 (95 % CI). HOOH production rates and yields were higher atlower pH values. There was no temperature dependence of the HOOH yield forformaldehyde or octanedioic acid between −5 to 20 °C and ice samples hadapproximately the same HOOH yield as the aqueous solutions. In contrast,HOOH yields in formate solutions were higher at 5 and 10 °C compared to−5 and 20 °C. Yields of HOOH in ice for solutions containing nitrate andeither phenylalanine, benzoate, octanal, or octanoic acid wereindistinguishable from zero. Our HOOH yields were approximately half thosefound in previous studies conducted using γ-radiolysis, but thisdifference might be due to the much lower (and more environmentallyrelevant) •OH formation rates in our experiments

Yields of hydrogen peroxide from the reaction of hydroxyl radical with organic compounds in solution and ice