Condensable iodine-containing vapors in the marine atmosphere may form particles in the marine boundary layer and affect the Earth's radiative budget. Recent studies on the speciation of iodine in aerosols reveal that soluble organic iodine (SOI) is globally ubiquitous and is the dominant iodine species. The exact molecular structures of the SOI species in aerosols, however, remain unknown. Previous investigations on iodine speciation in natural waters, soils and sediments indicate that a significant proportion of dissolved iodine was associated with natural organic matter (NOM). In this work we attempted to identify the molecular structures of SOI using LC/MS/MS. We reacted I2(aq) with humic and fulvic acids and examined the molecular structures of the iodinated derivatives. We then compared those findings with the molecular structures of SOI species found in aerosol samples collected over the Pacific Ocean. In a third step, we examined whether SOI is releasing iodide when reacting with dissolved hydrogen peroxide.

Reaction of organic iodine species in aerosols

244th National Meeting (2012)

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