Humidity influence on gas-particle phase partitioning of α-pinene + O3 secondary organic aerosol

Details Humidity influence on gas-particle phase partitioning of α-pinene + O3 secondary organic aerosol Humidity influence on gas-particle phase partitioning of α-pinene + O3 secondary organic aerosol

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3701802p&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 1, CiteID L01802

Physics

7

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions (0426, 1610), Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251)

Scientific paper

Water vapor uptake to particles could potentially affect organic-aerosol mass in three ways: first, water in the organic phase could reduce organic (equilibrium) partial pressures according to Raoult's law; second, an aqueous phase could attract water soluble organics according to Henry's law; finally, deliquescence of inorganic particle cores could mix the organic and inorganic particle phases, significantly diluting the organics and again reducing organic partial pressures according to Raoult's law. We present experiments using initially dry α-pinene + ozone secondary organic aerosol (SOA) on ammonium sulfate (AS) seeds at atmospheric concentrations in a smog chamber. After SOA formation, the chamber relative humidity is increased steadily by addition of steam to near 100%. Little subsequent SOA mass growth is observed, suggesting that none of these potential effects play a strong role in this system.

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