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

F. D. Pope; L. Harper; B. J. Dennis-Smither; P. T. Griffiths; S. L. Clegg; R. A. Cox

doi:10.1016/j.jaerosci.2010.02.012

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

F. D. Pope
, L. Harper
, B. J. Dennis-Smither
, P. T. Griffiths
, S. L. Clegg
, R. A. Cox

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

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.

Original language	English
Pages (from-to)	457-467
Number of pages	11
Journal	Journal of Aerosol Science
Volume	41
Issue number	5
DOIs	https://doi.org/10.1016/j.jaerosci.2010.02.012
Publication status	Published - 2010

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10.1016/j.jaerosci.2010.02.012

Cite this

@article{59e8d5b2765c4e7b8e353c2e43ce3630,

title = "Laboratory and modelling study of the hygroscopic properties of two model humic acid aerosol particles",

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.",

author = "Pope, \{F. D.\} and L. Harper and Dennis-Smither, \{B. J.\} and Griffiths, \{P. T.\} and Clegg, \{S. L.\} and Cox, \{R. A.\}",

year = "2010",

doi = "10.1016/j.jaerosci.2010.02.012",

language = "English",

volume = "41",

pages = "457--467",

journal = "Journal of Aerosol Science",

publisher = "Elsevier",

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TY - JOUR

T1 - Laboratory and modelling study of the hygroscopic properties of two model humic acid aerosol particles

AU - Pope, F. D.

AU - Harper, L.

AU - Dennis-Smither, B. J.

AU - Griffiths, P. T.

AU - Clegg, S. L.

AU - Cox, R. A.

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

U2 - 10.1016/j.jaerosci.2010.02.012

DO - 10.1016/j.jaerosci.2010.02.012

M3 - Article

VL - 41

SP - 457

EP - 467

JO - Journal of Aerosol Science

JF - Journal of Aerosol Science

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