Abstract
Gaseous and particulate semi volatile carbonyls have been measured in urban air using an annular denuder sampling system. Three dicarbonyls, five aliphatic aldehydes and two hydroxy carbonyls were observed. Concentrations of other biogenic and anthropogenic volatile organic compounds (VOCs), SO2, CO, NO2 and particle concentration were also measured. Estimated gas‐aerosol equilibrium constants for the carbonyls showed an inverse correlation with the concentrations of anthropogenic pollutants such as benzene, isopentane and SO2. This suggests that the increase in the fraction of non‐polar anthropogenic particles in the atmosphere could change the average property of the ambient aerosols and drive the gas particle equilibrium of the carbonyls to the gas phase. This trend is uncommon in remote forest air. In this study, we examined the factors controlling the equilibrium in the polluted atmosphere and show that there is a difference in gas‐aerosol partition between polluted and clean air.
Highlights
[2] Atmospheric fine particles are known to have an important role in the ambient atmosphere [Bidleman, 1988; Andreae and Crutzen, 1997]
Atmospheric carbonyls are a major component of atmospheric semi volatile constituents but there are few reports which describe the gas particle partitioning of SVOCs in real ambient air
We discuss the variation of gas particle partition coefficients of semi volatile organic compounds obtained in a field experiment, and its relationship with air quality
Summary
[2] Atmospheric fine particles are known to have an important role in the ambient atmosphere [Bidleman, 1988; Andreae and Crutzen, 1997]. The gas particle partition of these semi volatile compounds includes adsorption onto the aerosol, dissolution into the
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