Correction of sampler-to-sampler comparisons based on aerosol size distribution.
This article explains a simple method for correcting a sampler-to-sampler ratio for changes in size distribution by computing a bias factor that relates the measured ratio with a ratio determined from equations that describe the collection efficiency curves of the samplers while taking size distribu...
| Publicado en: | Journal of Occupational & Environmental Hygiene Vol. 4; no. 4; pp. 237 - 246 |
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| Autores principales: | , , , , , |
| Formato: | equations & formulas tables/charts Journal Article |
| Publicado: |
Taylor & Francis Ltd
Apr2007
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=106171402&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 106171402 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 15459624 V1L jtl: Journal of Occupational & Environmental Hygiene issn: 15459624 maglogo: Y pubinfo: dt: Apr2007 vid: 4 iid: 4 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 106171402 106171402 2009540802 10.1080/15459620701193533 NLM17365494 106171402 ppf: 237 ppct: 9 formats: fmt: @attributes: type: P tig: atl: Correction of sampler-to-sampler comparisons based on aerosol size distribution. aug: au: O'Shaughnessy PT Lo J Golla V Nakatsu J Tillery MI Reynolds S affil: The University of Iowa -- Occupational and Environmental Health, Iowa City, Iowa. sug: subj: Aerosols Analysis Air Pollutants, Occupational Analysis Environmental Monitoring Methods Occupational Exposure Analysis Aerosols Dust Analysis Equipment Design Particle Size ab: This article explains a simple method for correcting a sampler-to-sampler ratio for changes in size distribution by computing a bias factor that relates the measured ratio with a ratio determined from equations that describe the collection efficiency curves of the samplers while taking size distribution into account. Laboratory trials were conducted to determine whether the resulting bias factor is independent of aerosol size distribution. During these studies, a 3-piece cassette and respirable cyclone were compared with an inhalable sampler in both a still-air chamber and a moving-air chamber operated at 0.2 m/sec and 1.0 m/sec. An ISO test dust of various size fractions was generated to produce an aerosol with mass median aerodynamic diameter ranging from 1.4 mum to 10.1 mum. An organic dust consisting of ground grain material was also applied to the still-air chamber to demonstrate differences between dust types. Results showed that the bias value was significantly different between dust types for both the cyclone/ inhalable (p=0.001) and cassette/inhalable (p=0.033) comparisons but was not different between wind conditions for either comparison. All but one comparison had insignificant slopes when comparing the bias value with median diameter, indicating that the bias value could be used to correct for size distributions in most conditions. However, bias values determined when comparing the cyclone with the inhalable sampler in the still-air condition produced a positive slope for median diameters less than 4mum(p=0.008). Further research is needed to determine why the actual cyclone/inhalable ratio decreases relative to the expected ratio as the proportion of respirable particles increases. These results suggest that, for most conditions, the size-distribution compensation can be applied to sampler-to-sampler correlations provided that the original comparison was performed with the same dust type. pubtype: Academic Journal doctype: equations & formulas tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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