Laboratory and modelling study of the hygroscopic properties of two model humic acid aerosol particles

Pope, FD, Harper, L, Dennis-Smither, BJ, Griffiths, PT, Clegg, SL and Cox, RA (2010) Laboratory and modelling study of the hygroscopic properties of two model humic acid aerosol particles. Journal of Aerosol Science, 41 (5). pp. 457-467.

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Abstract

The hygroscopic properties of aerosol particles, composed of two different commercially available humic acids, have been investigated in the temperature range 293-295. K as a function of relative humidity using an electrodynamic balance. The measured mass growth factors of Sigma-Aldrich humic acid sodium salt (NaHA) and leonardite humic acid (LHA) at 90% relative humidity are 1.87±0.02 and 1.20±0.05, respectively. There is a general agreement between the results described in this study with previous TDMA results, which are undertaken with smaller particle ensembles and shorter aerosol-water equilibration times. The measured mass growth factors of Sigma-Aldrich humic acid sodium salt (NaHA) and leonardite humic acid (LHA) at 90% relative humidity are 1.87±0.05 and 1.20±0.05, respectively. The UNIFAC model was used to calculate the relationship between water activity and the concentrations of a modelled LHA molecule, and thus the hygroscopicity. The LHA molecule was modelled by both the Steelink monomer and the Northeastern-Temple-Birmingham humic acid monomer structural models.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
University of East Anglia > Faculty of Science > Research Groups > Marine and Atmospheric Sciences
University of East Anglia > Faculty of Science > Research Groups > Climate, Ocean and Atmospheric Sciences
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Depositing User: Rosie Cullington
Date Deposited: 15 Feb 2011 16:12
Last Modified: 04 Sep 2018 16:31
URI: https://ueaeprints.uea.ac.uk/id/eprint/20396
DOI: 10.1016/j.jaerosci.2010.02.012

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