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Extending traceability in airborne particle size distribution measurements beyond 10 µm: Counting efficiency and unit-to-unit variability of four aerodynamic particle size spectrometers
METAS, Switzerland.
METAS, Switzerland.
NMIJ, Japan.
METAS, Switzerland.
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2023 (English)In: Aerosol Science and Technology, ISSN 0278-6826, E-ISSN 1521-7388, Vol. 57, no 1, p. 24-34Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to establish traceable number concentration measurements of airborne particles beyond 10 μm in particle size. To this end, the primary standards for particle number concentration at the National Metrology Institutes of Switzerland and Japan were further developed to extend their measurement capabilities. Details on the upgraded setup are provided. An inter-comparison of the two primary standards using an optical particle counter as transfer standard showed that these agree well within the stated uncertainties at polystyrene (PS) equivalent optical diameter of 15 µm. Subsequently, four Model 3321 (TSI Inc., USA) aerodynamic particle size spectrometers (APS) were calibrated against the primary standard of Switzerland using size-certified PS spheres with optical/aerodynamic diameter up to 20 µm as test aerosols. The counting efficiency profile and unit-to-unit variability of the APS units were determined. The results presented here can be useful for the analysis and interpretation of data collected by the different atmospheric aerosol networks worldwide. The outlined methodology can also be applied in the calibration of automated bio-aerosol monitors. © 2022 The Author(s).

Place, publisher, year, edition, pages
Taylor and Francis Ltd. , 2023. Vol. 57, no 1, p. 24-34
Keywords [en]
Jason Olfert, Aerodynamics, Atmospheric aerosols, Efficiency, Particle size analysis, Spectrometers, Aerodynamic particles, Airborne particle, Counting efficiency, Number concentration, Optical-, Particle size distribution measurement, Particles sizes, Primary standards, Switzerland, Particle size
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:ri:diva-61419DOI: 10.1080/02786826.2022.2139659Scopus ID: 2-s2.0-85142268996OAI: oai:DiVA.org:ri-61419DiVA, id: diva2:1717466
Note

METAS, Lund University, RISE and LNE acknowledge funding from the EMPIR Aeromet II project. The EMPIR programme is co-financed by the Participating States and from the European Union’s Horizon 2020 research and Innovation Programme. METAS was also supported by internal funds.

Available from: 2022-12-08 Created: 2022-12-08 Last updated: 2023-07-06Bibliographically approved

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