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  Tandem configuration of differential mobility and centrifugal particle mass analysers for investigating aerosol hygroscopic properties

Vlasenko, S. S., Su, H., Pöschl, U., Andreae, M. O., & Mikhailov, E. F. (2016). Tandem configuration of differential mobility and centrifugal particle mass analysers for investigating aerosol hygroscopic properties. Atmospheric Measurement Techniques Discussions, 8. doi:10.5194/amt-2016-249.

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Vlasenko, S. S., Author
Su, H.1, Author              
Pöschl, U.2, Author              
Andreae, M. O.1, Author              
Mikhailov, E. F.2, Author              
Affiliations:
1Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826286              
2Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

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 Abstract: A tandem arrangement of Differential Mobility Analyser and Humidified Centrifugal Particle Mass Analyser (DMA-HCPMA) was developed to measure the deliquescence and efflorescence thresholds and the water uptake of submicron particles over the relative humidity (RH) range from 10 to 95 %. The hygroscopic growth curves obtained for ammonium sulfate and sodium chloride test aerosols are consistent with thermodynamic model predictions and liter- ature data. The DMA-HCPMA system was applied to measure the hygroscopic properties of urban aerosol particles, and the kappa mass interaction model (KIM) was used to characterize and parameterize the concentration-dependent water uptake observed in the 50–95 % RH range. For DMA-selected 160 nm dry particles (modal mass of 3.5 fg), we obtained a volume-based hygroscopicity parameter, κv≈0.2, which is consistent with literature data for freshly emitted urban aerosols. Overall, our results show that the DMA-HCPMA system can be used to measure size-resolved mass growth factors of atmospheric aerosol particles upon hydration and dehydration up to 95 % RH. Direct measurements of particle mass avoid the typical complications associated with the commonly used mobility-diameter-based HTDMA technique (mainly due to poorly defined or unknown morphology and density).

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 Dates: 20162016
 Publication Status: Published in print
 Pages: 63
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.5194/amt-2016-249
 Degree: -

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Title: Atmospheric Measurement Techniques Discussions
  Other : Atmos. Meas. Tech. Discuss.
  Abbreviation : AMTD
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau : Copernicus
Pages: 23 Volume / Issue: 8 Sequence Number: - Start / End Page: - Identifier: Other: 1867-8610
CoNE: https://pure.mpg.de/cone/journals/resource/1867-8610