Atmospheric Chemistry and Physics
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8
1
2008
10.5194/acp-8-91-2008
http://www.atmos-chem-phys.net/8/91/2008/
http://www.atmos-chem-phys.net/8/91/2008/acp-8-91-2008.html
http://www.atmos-chem-phys.net/8/91/2008/acp-8-91-2008.pdf
91
109
2008-01-14
The interaction of N<sub>2</sub>O<sub>5</sub> with mineral dust: aerosol flow tube and Knudsen reactor studies
C. Wagner
F. Hanisch
N. Holmes
H. de Coninck
G. Schuster
J. N. Crowley
crowley@mpch-mainz.mpg.de
Max-Planck-Institut für Chemie, Mainz, Germany
now at: Bayerisches Staatsministerium für Umwelt, Gesundheit und Verbraucherschutz, Rosenkavalierplatz 2, 81925 München, Germany
now at: International Laboratory for Air Quality and Health, QUT Gardens Point, 2 George Street, Brisbane, 4001 QLD, Australia
now at: Unit Policy Studies of the Energy research Centre of the Netherlands, (ECN), VU University of Amsterdam (IVM), Radarweg 60, 1040 AW Amsterdam, The Netherlands
The interaction of mineral dust with N<sub>2</sub>O<sub>5</sub> was investigated using
both airborne mineral aerosol (using an aerosol flow reactor with variable
relative humidity) and bulk samples (using a Knudsen reactor at zero
humidity). Both authentic (Saharan, SDCV) and synthetic dust samples
(Arizona test dust, ATD and calcite, CaCO<sub>3</sub>) were used to derive
reactive uptake coefficients (γ). The aerosol experiments (Saharan
dust only) indicated efficient uptake, with e.g. a value of
γ(SDCV)=(1.3±0.2)×10<sup>−2</sup> obtained at zero relative humidity.
The values of γ obtained for bulk substrates in the Knudsen reactor
studies are upper limits due to assumptions of available surface area, but
were in reasonable agreement with the AFT measurements, with:
γ(SDCV)=(3.7±1.2)×10<sup>−2</sup>, γ(ATD)=(2.2±0.8)×10<sup>−2</sup>
and γ(CaCO<sub>3</sub>=(5±2)×10<sup>−2</sup>. The errors quoted are statistical only. The results are
compared to literature values and assessed in terms of their impact on
atmospheric N<sub>2</sub>O<sub>5</sub>.
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