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The heterogeneous reaction of OH radicals with sub-micron squalaneparticles, in the presence of O2, is used as a model system to explorethe fundamental chemical mechanisms that control the oxidative aging oforganic aerosols in the atmosphere. Detailed kinetic measurements combinedwith elemental mass spectrometric analysis reveal that the reaction proceedssequentially by adding an average of one oxygenated functional group perreactive loss of squalane. The reactive uptake coefficient of OH withsqualane particles is determined to be 0.3±0.07 at an average OHconcentration of ~1×1010 molecules cm−3. Based on acomparison between the measured particle mass and model predictions itappears that significant volatilization of a reduced organic particle wouldbe extremely slow in the real atmosphere. However, as the aerosols becomemore oxygenated, volatilization becomes a significant loss channel fororganic material in the particle-phase. Together these results provide achemical framework in which to understand how heterogeneous chemistrytransforms the physiochemical properties of particle-phase organic matter inthe troposphere

atmospheric chemistry and physics

The heterogeneous reaction of hydroxyl radicals with sub-micron squalane particles: a model system for understanding the oxidative aging of ambient aerosols