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Realistic indoor nano-aerosols for a human exposure facility

Isaxon, Christina LU ; Dierschke, Katrin LU ; Pagels, Joakim LU ; Wierzbicka, Aneta LU ; Gudmundsson, Anders LU ; Löndahl, Jakob LU ; Hagerman, I.; Berglund, M.; Assarsson, Eva LU and Andersson, Ulla B LU , et al. (2013) In Journal of Aerosol Science 60. p.55-66
Abstract
The aim of this study was to achieve realistic levels of two different types of aerosols commonly abundant in indoor environments in an experimental chamber intended for human exposure studies and aerosol characterization. The aerosols chosen were particles from candle lights (in particle number dominated by inorganic water soluble particles) and from ozone-terpene reactions (organic particles). The aerosol generation and characterization system consisted of a controlled air tight stainless steel 22 m(3) chamber, to which the generation set-ups were connected. No air could enter or leave the chamber except through a conditioning system by which temperature, relative humidity and air exchange rate could be controlled. Candle smoke aerosol... (More)
The aim of this study was to achieve realistic levels of two different types of aerosols commonly abundant in indoor environments in an experimental chamber intended for human exposure studies and aerosol characterization. The aerosols chosen were particles from candle lights (in particle number dominated by inorganic water soluble particles) and from ozone-terpene reactions (organic particles). The aerosol generation and characterization system consisted of a controlled air tight stainless steel 22 m(3) chamber, to which the generation set-ups were connected. No air could enter or leave the chamber except through a conditioning system by which temperature, relative humidity and air exchange rate could be controlled. Candle smoke aerosol was generated from ten candles burning in a 1.33 m(3) glass and stainless steel chamber. The aerosol was diluted by clean air from the conditioning system before entering the chamber. Terpene vapor was generated by passing pure nitrogen through a glass bottle containing limonene oil. Ozone was generated by a spark discharge using pure O-2, and was added to the ventilation air flow downstream the inlet for terpene vapors and upstream the inlet to the chamber. Both aerosols were characterized with respect to number and mass concentrations, size distribution and chemical composition. Particle number concentration in the size range 10-650 nm could be varied from <10 cm(-3) to more than 900,000 cm(-3) (for candle smoke) or to more than 30,000 cm(-3) (for particles formed in a 160 ppb terpene/40 ppb ozone mixture). Furthermore, the set-ups were evaluated by, for each source, repeating the generation at six three-hour long events. For both aerosols repeatable generations at pre-determined concentration levels, that were stable over time, could be achieved. The results show that realistic concentrations of aerosols from real-world environments could be reproduced in a well-controlled manner and that this set-up could be used both for aerosol characterization and for human exposures. (C) 2013 Elsevier Ltd. All rights reserved. (Less)
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Contribution to journal
publication status
published
subject
keywords
Indoor aerosol, Exposure, Generation, Characterization, Candle smoke, SOA
in
Journal of Aerosol Science
volume
60
pages
55 - 66
publisher
Elsevier
external identifiers
  • wos:000319174800005
  • scopus:84875782420
ISSN
0021-8502
DOI
10.1016/j.jaerosci.2013.02.003
project
MERGE
language
English
LU publication?
yes
id
f8707c23-710f-4f58-a3b9-7c1b6d0bc73a (old id 3931567)
date added to LUP
2013-07-30 10:50:03
date last changed
2019-08-18 03:53:35
@article{f8707c23-710f-4f58-a3b9-7c1b6d0bc73a,
  abstract     = {The aim of this study was to achieve realistic levels of two different types of aerosols commonly abundant in indoor environments in an experimental chamber intended for human exposure studies and aerosol characterization. The aerosols chosen were particles from candle lights (in particle number dominated by inorganic water soluble particles) and from ozone-terpene reactions (organic particles). The aerosol generation and characterization system consisted of a controlled air tight stainless steel 22 m(3) chamber, to which the generation set-ups were connected. No air could enter or leave the chamber except through a conditioning system by which temperature, relative humidity and air exchange rate could be controlled. Candle smoke aerosol was generated from ten candles burning in a 1.33 m(3) glass and stainless steel chamber. The aerosol was diluted by clean air from the conditioning system before entering the chamber. Terpene vapor was generated by passing pure nitrogen through a glass bottle containing limonene oil. Ozone was generated by a spark discharge using pure O-2, and was added to the ventilation air flow downstream the inlet for terpene vapors and upstream the inlet to the chamber. Both aerosols were characterized with respect to number and mass concentrations, size distribution and chemical composition. Particle number concentration in the size range 10-650 nm could be varied from &lt;10 cm(-3) to more than 900,000 cm(-3) (for candle smoke) or to more than 30,000 cm(-3) (for particles formed in a 160 ppb terpene/40 ppb ozone mixture). Furthermore, the set-ups were evaluated by, for each source, repeating the generation at six three-hour long events. For both aerosols repeatable generations at pre-determined concentration levels, that were stable over time, could be achieved. The results show that realistic concentrations of aerosols from real-world environments could be reproduced in a well-controlled manner and that this set-up could be used both for aerosol characterization and for human exposures. (C) 2013 Elsevier Ltd. All rights reserved.},
  author       = {Isaxon, Christina and Dierschke, Katrin and Pagels, Joakim and Wierzbicka, Aneta and Gudmundsson, Anders and Löndahl, Jakob and Hagerman, I. and Berglund, M. and Assarsson, Eva and Andersson, Ulla B and Jönsson, Bo A and Nojgaard, J. K. and Eriksson, Axel and Nielsen, Jörn and Bohgard, Mats},
  issn         = {0021-8502},
  keyword      = {Indoor aerosol,Exposure,Generation,Characterization,Candle smoke,SOA},
  language     = {eng},
  pages        = {55--66},
  publisher    = {Elsevier},
  series       = {Journal of Aerosol Science},
  title        = {Realistic indoor nano-aerosols for a human exposure facility},
  url          = {http://dx.doi.org/10.1016/j.jaerosci.2013.02.003},
  volume       = {60},
  year         = {2013},
}