References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-8-799-2008

Investigation of molar volume and surfactant characteristics of water-soluble organic compounds in biomass burning aerosol

Asa-Awuku

¹ Sullivan

A. P.

² ⁴ Hennigan

C. J.

³ Weber

R. J.

² Nenes

¹ ²

School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA

School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA

School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA , USA

now at: The department of Atmospheric Sciences, Colorado State University, Fort Collins, CO, USA

18 02 2008

8 4 799 812

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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In this study, we characterize the CCN activity of the water-soluble organics in biomass burning aerosol. The aerosol after collection upon filters is dissolved in water using sonication. Hydrophobic and hydrophilic components are fractionated from a portion of the original sample using solid phase extraction, and subsequently desalted. The surface tension and CCN activity of these different samples are measured with a KSV CAM 200 goniometer and a DMT Streamwise Thermal Gradient CCN Counter, respectively. The measurements show that the strongest surfactants are isolated in the hydrophobic fraction, while the hydrophilics exhibit negligible surface tension depression. The presence of salts (primarily (NH4)2SO4) in the hydrophobic fraction substantially enhances surface tension depression; their synergistic effects considerably enhance CCN activity, exceeding that of pure (NH4)2SO4. From our analysis, average thermodynamic properties (i.e, molar volume) are determined for samples using our newly developed Köhler Theory Analysis (KTA) method. The molar mass of the hydrophilic and hydrophobic aerosol components is estimated to be 87±26 g mol−1 and 780±231 g mol−1, respectively. KTA also suggests that the relative proportion (in moles) of hydrophobic to hydrophilic compounds in the original sample to be 1:3. For the first time, KTA is applied to an aerosol with this level of complexity and displays its potential for providing physically-based constraints for GCM parameterizations of the aerosol indirect effect.

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