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| Titel |
An experimental technique for the direct measurement of N2O5 reactivity on ambient particles |
| VerfasserIn |
T. H. Bertram, J. A. Thornton, T. P. Riedel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 2, no. 1 ; Nr. 2, no. 1 (2009-06-16), S.231-242 |
| Datensatznummer |
250000440
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| Publikation (Nr.) |
 copernicus.org/amt-2-231-2009.pdf |
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| Zusammenfassung |
| An experimental approach for the direct measurement of trace gas reactivity
on ambient aerosol particles has been developed. The method utilizes a newly
designed entrained aerosol flow reactor coupled to a custom-built chemical
ionization mass spectrometer. The experimental method is described via
application to the measurement of the N2O5 reaction probability,
γ (N2O5). Laboratory investigations on well characterized
aerosol particles show that measurements of γ (N2O5) observed
with this technique are in agreement with previous observations, using
conventional flow tube methods, to within ±20% at atmospherically
relevant particle surface area concentrations
(0–1000 μm2 cm−3). Uncertainty in the measured
γ (N2O5) is discussed in the context of fluctuations in
potential ambient biases (e.g., temperature, relative humidity and trace gas
loadings). Under ambient operating conditions we estimate a single-point
uncertainty in γ (N2O5) that ranges between
± (1.3×10-2 + 0.2×γ (N2O5)), and
± (1.3×10-3 + 0.2×γ (N2O5)) for
particle surface area concentrations of 100 to 1000 μm2 cm−3,
respectively. Examples from both laboratory investigations and field
observations are included alongside discussion of future applications for the
reactivity measurement and optimal deployment locations and conditions. |
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