Abstract
Using smog chamber,Secondary organic aerosol (SOA) formation from the reaction of isoprene with OH radical was studied.Gaseous products were determined by proton-transfer-reaction mass spectrometer (PTR-MS) while SOA concentration and size distribution were determined by EEPS3090.The dominating gaseous products were methacrolein (MAC)/methyl vinyl ketone (MVK),acetaldehyde,formaldehyde,methanol,formic acid/ethanol,glycollic aldehyde,methylglyoxal,acetone/propionaldehyde and so on.The highest production of MAC/MVK and acetaldehyde were 13.78% 37.72% and 5.38% 9.34% (based on C).SOA production and its mean size increased with increasing reacted isoprene.When the gas phase products were stable,the SOA yields were in the range of 5.6% 11.7% and the particle sizes were from 22 nm to 165 nm.
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