Istituto di scienze dell'atmosfera e del clima     
Facchini M. C., Decesari S., Rinaldi M., Carbone C., Finessi E., Mircea M., Fuzzi S., Moretti F., Tagliavini E., Ceburnis D., O'Dowd C. Important Source of Marine Secondary Organic Aerosol from Biogenic Amines. In: Environmental Science & Technology, vol. 42 (24) pp. 9116 - 9121. American Chemical Society, 2008.
Relevant concentrations of dimethyl- and diethylammonium salts(DMA(+) and DEA(+))were measured in submicrometer marine aerosol collected over the North Atlantic during periods of high biological activity (HBA) in clean air masses (median concentration (minimum-maximum) = 26 (6-56) ng m(-3)). Much lower concentrations were measured during periods of low biological activity (LBA): 1 (<0.4-20) ng m(-3) and when polluted air masses were advected to the sampling site: 2 (<0.2-24) ng m(-3). DMA(+) and DEA(+) are the most abundant organic species, second only to MSA, detected in fine marine particles representing on average 11% of the secondary organic aerosol (SOA)fraction and a dominant part (35% on average) of the water-soluble organic nitrogen (WSON). Several observations support the hypothesis that DMA(+) and DEA(+) have a biogenic oceanic source and are produced through the reaction of gaseous amines with sulfuric acid or acidic sulfates. Moreover, the water-soluble fraction of nascent marine aerosol particles produced by bubble-bursting experiments carried out in parallel to ambient aerosol sampling over the open ocean showed WSON, DMA(+), and DEA(+) concentrations always below the detection limit, thus excluding an important primary sea spray source.
DOI: 10.1021/es8018385
Subject Marine SOA
Secondary amines
Biogenic amines
Marine aerosol WSON

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