Deposition uniformity and particle size distribution of ambient aerosol collected with a rotating drum impactor

dc.contributor.authorBukowiecki, Nicolas
dc.contributor.authorRichard, Agnes
dc.contributor.authorFurger, Markus
dc.contributor.authorWeingartner, Ernest
dc.contributor.authorAguirre, Myriam
dc.contributor.authorHuthwelker, Thomas
dc.contributor.authorLienemann, Peter
dc.contributor.authorGehrig, Robert
dc.contributor.authorBaltensperger, Urs
dc.date.accessioned2024-08-13T11:57:03Z
dc.date.available2024-08-13T11:57:03Z
dc.date.issued2009-06-30
dc.description.abstractRotating drum impactors (RDI) are cascade type impactors used for size and time resolved aerosol sampling, mostly followed by spectrometric analysis of the deposited material. They are characterized by one rectangular nozzle per stage and are equipped with an automated stepping mechanism for the impaction wheels. An existing three-stage rotating drum impactor was modified, to obtain new midpoint cutoff diameters at 2.5 μm, 1 μm, and 0.1 μm, respectively. For RDI samples collected under ambient air conditions, information on the size-segregation and the spatial uniformity of the deposited particles are key factors for a reliable spectrometric analysis of the RDI deposits. Two aerodynamic particle sizers (APS) were used for the determination of the RDI size fractionation characteristics, using polydisperse laboratory room air as quasi-stable proxy for urban ambient air. This experimental approach was suitable for the scope of this study, but was subject to numerous boundary conditions that limit a general use. Aerodynamic stage penetration midpoint diameters were estimated to be 2.4 and 1.0 μm for the first two RDI stages. Additionally, the spatial uniformity and geometrical size distribution of the deposited aerosol were investigated using micro-focus synchrotron radiation X-ray fluorescence spectrometry (micro-SR-XRF) and transmission electron microscopy (TEM), respectively. The size distribution of the particles found on the TEM samples agreed well with the results from the APS experiments. The RDI deposits showed sufficient uniformity for subsequent spectrometric analysis, but in the 2.5–10 μm size range the particle area density was very low. All of the applied methods confirmed the theoretical cutoff values of the modified RDI and showed that compared to other cascade impactors, the determined stage penetration sharpness was rather broad for the individual impactor stages.
dc.identifier.doi10.1080/02786820903002431
dc.identifier.issn0278-6826
dc.identifier.issn1521-7388
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/46657
dc.issue9
dc.language.isoen
dc.publisherTaylor & Francis
dc.relation.ispartofAerosol Science and Technology
dc.subject.ddc550 - Geowissenschaften
dc.titleDeposition uniformity and particle size distribution of ambient aerosol collected with a rotating drum impactor
dc.type01A - Beitrag in wissenschaftlicher Zeitschrift
dc.volume43
dspace.entity.typePublication
fhnw.InventedHereNo
fhnw.ReviewTypeAnonymous ex ante peer review of a complete publication
fhnw.affiliation.hochschuleHochschule für Technikde_CH
fhnw.affiliation.institutlnstitut für Sensorik und Elektronikde_CH
fhnw.openAccessCategoryClosed
fhnw.pagination891-901
fhnw.publicationStatePublished
relation.isAuthorOfPublication05dd9a19-7a24-4325-805a-2d121483b168
relation.isAuthorOfPublication.latestForDiscovery05dd9a19-7a24-4325-805a-2d121483b168
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