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| Titel |
A concept of an automated function control for ambient aerosol measurements using mobility particle size spectrometers |
| VerfasserIn |
A. Schladitz, M. Merkel, S. Bastian, W. Birmili, K. Weinhold, G. Löschau, A. Wiedensohler |
| 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 ; 7, no. 4 ; Nr. 7, no. 4 (2014-04-28), S.1065-1073 |
| Datensatznummer |
250115701
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| Publikation (Nr.) |
 copernicus.org/amt-7-1065-2014.pdf |
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| Zusammenfassung |
An automated function control unit was developed to regularly check the
ambient particle number concentration derived from a mobility particle size
spectrometer as well as its zero-point behaviour. The function control allows
unattended quality assurance experiments at remote air quality monitoring or
research stations under field conditions. The automated function control also
has the advantage of being able to get a faster system stability response
than the recommended on-site comparisons with reference instruments. The
method is based on a comparison of the total particle number concentration
measured by a mobility particle size spectrometer and a condensation particle
counter while removing diffusive particles smaller than 20 nm in diameter.
In practice, the small particles are removed by a set of diffusion screens,
as traditionally used in a diffusion battery. Another feature of the
automated function control is to check the zero-point behaviour of the
ambient aerosol passing through a high-efficiency particulate air (HEPA)
filter.
The performance of the function control is illustrated with the aid of a
1-year data set recorded at Annaberg-Buchholz, a station in the Saxon air
quality monitoring network. During the period of concern, the total particle
number concentration derived from the mobility particle size spectrometer
slightly overestimated the particle number concentration recorded by the
condensation particle counter by 2 % (grand average). Based on our first
year of experience with the function control, we developed tolerance criteria
that allow a performance evaluation of a tested mobility particle size
spectrometer with respect to the total particle number concentration. We
conclude that the automated function control enhances the quality and
reliability of unattended long-term particle number size distribution
measurements. This will have beneficial effects for intercomparison studies
involving different measurement sites, and help provide a higher data
accuracy for cohort health and climate research studies. |
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