Articles | Volume 13, issue 13
Atmos. Chem. Phys., 13, 6647–6662, 2013
https://doi.org/10.5194/acp-13-6647-2013
Atmos. Chem. Phys., 13, 6647–6662, 2013
https://doi.org/10.5194/acp-13-6647-2013

Research article 12 Jul 2013

Research article | 12 Jul 2013

Vapor pressures of substituted polycarboxylic acids are much lower than previously reported

A. J. Huisman1,*, U. K. Krieger1, A. Zuend2,**, C. Marcolli1, and T. Peter1 A. J. Huisman et al.
  • 1Institute for Atmospheric and Climate Science, ETH Zurich, 8092 Zurich, Switzerland
  • 2Department of Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
  • *now at: Chemistry Department, Union College, Schenectady, New York 12308, USA
  • **now at: Institute for Atmospheric and Climate Science, ETH Zurich, 8092 Zurich, Switzerland

Abstract. The partitioning of compounds between the aerosol and gas phase is a primary focus in the study of the formation and fate of secondary organic aerosol. We present measurements of the vapor pressure of 2-methylmalonic (isosuccinic) acid, 2-hydroxymalonic (tartronic) acid, 2-methylglutaric acid, 3-hydroxy-3-carboxy-glutaric (citric) acid and DL-2,3-dihydroxysuccinic (DL-tartaric) acid, which were obtained from the evaporation rate of supersaturated liquid particles levitated in an electrodynamic balance. Our measurements indicate that the pure component liquid vapor pressures at 298.15 K for tartronic, citric and tartaric acids are much lower than the same quantity that was derived from solid state measurements in the only other room temperature measurement of these materials (made by Booth et al., 2010). This strongly suggests that empirical correction terms in a recent vapor pressure estimation model to account for the inexplicably high vapor pressures of these and similar compounds should be revisited, and that due caution should be used when the estimated vapor pressures of these and similar compounds are used as inputs for other studies.

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