Abstract
A laboratory model ocean-atmosphere study was undertaken to investigate the mechanisms causing iodine enrichment of up to 500 (compared to the iodine content of sea water) on atmospheric sea-salt particles produced by bubbles in the sea. Experiments were run both by using 131I tracer in sea water and by using iodine analysis by neutron activation in untreated fresh sea water. Particles produced by bubbling in the model ocean were separated into size fractions with a cascade impactor. Gaseous iodine was collected on activated charcoal. The results indicate that organically bound iodine probably accounts for an initial iodine enrichment on the particles and may also explain the characteristic U shape of the iodine enrichment versus particle size curve. It appears that gaseous iodine is also a major factor in determining the iodine enrichment on marine atmospheric particulate matter. The mechanism for production of gaseous iodine is still uncertain.
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