Solution-Formation of secondary organic aerosol

Formation of secondary organic aerosol

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Reference no: EM13869168

Abstract :

The atmospheric oxidation of isoprene (2-methyl-1,3-butadiene, C5H8) leads to the formation of secondary organic aerosol (SOA). In this study, the mechanism of SOA formation by isoprene photooxidation is comprehensively investigated, by measurements of SOA yields over a range of experimental conditions, namely isoprene and NOx concentrations. Hydrogen peroxide is used as the radical precursor, substantially constraining the observed gas-phase chemistry; all oxidation is dominated by the OH radical, and organic peroxy radicals (RO2) react only with HO2 (formed in the OH+ H₂O₂ reaction) or NO concentrations, including NOx free conditions. At high NOx, yields are found to decrease substantially with increasing [NOx], indicating the importance of RO2 chemistry in SOA formation. Under low-NOx conditions, SOA mass is observed to decay rapidly, a result of chemical reactions of semi-volatile SOA components, most likely organic hydroperoxides.

Outlines:

Mechanism of SOA formation from isoprene oxidation
Laboratory measurements of aerosol growth from isoprene oxidation
Gas-phase oxidation
NOx level (RO2 chemistry)

Reference no: EM13869168

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Formation of secondary organic aerosol : The atmospheric oxidation of isoprene (2-methyl-1,3-butadiene, C5H8) leads to the formation of secondary organic aerosol (SOA). In this study, the mechanism of SOA formation by isoprene photooxidation is comprehensively investigated, by measuremen..

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Formation of secondary organic aerosol

Reference no: EM13869168

Reference no: EM13869168

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