Gas-particle partitioning of alcohol vapors on organic aerosols

Environmental Science & Technology
Lap P ChanChak K Chan

Abstract

Single particle levitation using an electrodynamic balance (EDB) has been found to give accurate and direct hygroscopic measurements (gas-particle partitioning of water) for a number of inorganic and organic aerosol systems. In this paper, we extend the use of an EDB to examine the gas-particle partitioning of volatile to semivolatile alcohols, including methanol, n-butanol, n-octanol, and n-decanol, on levitated oleic acid particles. The measured K(p) agreed with Pankow's absorptive partitioning model. At high n-butanol vapor concentrations (10(3) ppm), the uptake of n-butanol reduced the average molecular-weight of the oleic acid particle appreciably and hence increased the K(p) according to Pankow's equation. Moreover, the hygroscopicity of mixed oleic acid/n-butanol particles was higher than the predictions given by the UNIFAC model (molecular group contribution method) and the ZSR equation (additive rule), presumably due to molecular interactions between the chemical species in the mixed particles. Despite the high vapor concentrations used, these findings warrant further research on the partitioning of atmospheric organic vapors (K(p)) near sources and how collectively they affect the hygroscopic properties of organic aer...Continue Reading

References

Jun 22, 2002·Environmental Science & Technology·Man Yee Choi, Chak K Chan
Jan 14, 2003·Annual Review of Physical Chemistry·John H Seinfeld, James F Pankow
Oct 4, 2003·Environmental Science & Technology·Bharadwaj ChandramouliRichard M Kamens
Mar 20, 2008·The Journal of Physical Chemistry. a·Christopher D CappaA R Ravishankara

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Citations

May 18, 2021·Chemistry, an Asian Journal·Yuan-Pin ChangChun-Hu Chen
Aug 26, 2020·Environmental Science & Technology·Yiming QinScot T Martin

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