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Intercomparison of 15 Aerodynamic Particle Size Spectrometers (APS 3321): Uncertainties in Particle Sizing and Number Size Distribution.

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    0458521 - ÚCHP 2017 RIV DE eng J - Journal Article
    Pfeifer, S. - Müller, T. - Weinhold, K. - Zíková, Naděžda - dos Santos, S.M. - Marinoni, A. - Bischof, O.F. - Kykal, C. - Ries, L. - Meinhardt, F. - Aalto, P. - Mihalopoulos, N. - Wiedensohler, A.
    Intercomparison of 15 Aerodynamic Particle Size Spectrometers (APS 3321): Uncertainties in Particle Sizing and Number Size Distribution.
    Atmospheric Measurement Techniques. Roč. 9, č. 4 (2016), s. 1545-1551. ISSN 1867-1381
    EU Projects: European Commission(XE) 262254 - ACTRIS
    Institutional support: RVO:67985858
    Keywords : counting efficiency * aerodynamic particle size spectrometers * laboratory study
    Subject RIV: CF - Physical ; Theoretical Chemistry
    Impact factor: 3.089, year: 2016

    In a laboratory study within the framework of ACTRIS, 15 aerodynamic particle size spectrometers (APS model 3321, TSI Inc., St. Paul, MN, USA) were compared with a focus on flow rates, particle sizing, and the unit-tounit variability of the particle number size distribution. Flow rate deviations were relatively small (within a few percent), while the sizing accuracy was found to be within 10% compared to polystyrene latex (PSL) reference particles. The unit-to-unit variability in terms of the particle number size distribution during this study was within 10% to 20% for particles in the range of 0.9 up to 3 μm, which is acceptable for atmospheric measurements. For particles smaller than that, the variability increased up to 60 %, probably caused by differences in the counting efficiencies of
    individual units. Number size distribution data for particles smaller than 0.9 μm in aerodynamic diameter should only be used with caution. For particles larger than 3 μm, the unit-tounit variability increased as well. A possible reason is an insufficient sizing accuracy in combination with a steeply sloping particle number size distribution and the increasing uncertainty due to decreasing counting. Particularly this uncertainty of the particle number size distribution must be considered if higher moments of the size distribution such as the particle volume or mass are calculated, which require the
    conversion of the aerodynamic diameter measured to a volume equivalent diameter. In order to perform a quantitative quality assurance, a traceable reference method for the particle number concentration in the size range 0.5–3 μm is needed.
    Permanent Link: http://hdl.handle.net/11104/0258795
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