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Method for measuring the hygroscopic behaviour of lower volatility fractions in an internally mixed aerosol

Johnson, Graham R., Ristovski, Zoran, & Morawska, Lidia (2004) Method for measuring the hygroscopic behaviour of lower volatility fractions in an internally mixed aerosol. Journal of Aerosol Science, 35(4), pp. 443-455.

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Abstract

A tandem differential mobility analyser system combining volatilisation and humidification aerosol conditioning to allow the observation of hygroscopic behaviour for non-volatile residues in sulphate aerosols in real time has been developed and demonstrated. The Volatilisation and Humidification Tandem Differential Mobility Analyser (VH-TDMA) system can measure changes in the hygroscopic behaviour of heterogeneously nucleated aerosol as one or more semi-volatile species are removed through thermal evaporation or decomposition.

The VH-TDMA system has the potential to distinguish between submicrometer particles containing residues of differing volatility and hygroscopic growth and can do so for residue diameters as small as 5 nm. The technique has the potential to distinguish between components such as sea salt and combustion derived particles within submicrometer sulphate aerosols and will find application in marine and combustion aerosol research investigating nucleation, coagulation and secondary aerosol formation processes.

Hygroscopic growth and volatility data measured with the system are presented for Di-2-ethylhexyl-sebacate (DEHS), sodium chloride, ammonium nitrate, ammonium sulphate, sulphuric acid, ammonium bisulphate and methane sulphonic acid, as single aerosol species for comparison with values reported by other authors. Results of investigations of aerosols containing mixtures of two species are also presented.

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ID Code: 1124
Item Type: Journal Article
Keywords: aerosol, tandem differential mobility analyser, volatility, Ammonium Nitrate, TDMA, evaporation, ammonium sulfate, ammonium bisulfate, methane sulfonic acid, MSA, sodium chloride, DEHS, hygroscopic growth, growth factor, VH, TDMA, thermal decomposition, humidity, heterogeneous, Sulfate
DOI: 10.1016/j.jaerosci.2003.10.008
ISSN: 0021-8502
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > ATMOSPHERIC SCIENCES (040100)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2004 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher
Deposited On: 27 Apr 2005
Last Modified: 29 Feb 2012 23:03

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