Metrological Assessment of a Portable Analyzer for Monitoring the Particle Size Distribution of Ultrafine Particles

Details

• Personal Author:
  Buonanno G ; Cauda, Emanuele G. ; Marini S ; Stabile L
• Description:
  Adverse health effects caused by worker exposure to ultrafine particles have been detected in recent years. The scientific community focuses on the assessment of ultrafine aerosols in different microenvironments in order to determine the related worker exposure/dose levels. To this end, particle size distribution measurements have to be taken along with total particle number concentrations. The latter are obtainable through hand-held monitors. A portable particle size distribution analyzer (Nanoscan SMPS 3910, TSI Inc.) was recently commercialized, but so far no metrological assessment has been performed to characterize its performance with respect to well-established laboratory- based instruments such as the scanning mobility particle sizer (SMPS) spectrometer. The present paper compares the aerosol monitoring capability of the Nanoscan SMPS to the laboratory SMPS in order to evaluate whether the Nanoscan SMPS is suitable for field experiments designed to characterize particle exposure in different microenvironments. Tests were performed both in a Marple calm air chamber, where fresh diesel particulate matter and atomized dioctyl phthalate particles were monitored, and in microenvironments, where outdoor, urban, indoor aged, and indoor fresh aerosols were measured. Results show that the Nanoscan SMPS is able to properly measure the particle size distribution for each type of aerosol investigated, but it overestimates the total particle number concentration in the case of fresh aerosols. In particular, the test performed in the Marple chamber showed total concentrations up to twice those measured by the laboratory SMPS - likely because of the inability of the Nanoscan SMPS unipolar charger to properly charge aerosols made up of aggregated particles. Based on these findings, when field test exposure studies are conducted, the Nanoscan SMPS should be used in tandem with a condensation particle counter in order to verify and correct the particle size distribution data. [Description provided by NIOSH]
• Subjects:
  Aerosols Air Pollutants, Occupational Dust Occupational Health Particulate Matter Safety
• Keywords:
  Aerosol-particles Airborne-dusts Airborne-particles Analytical-instruments Analytical-processes Author Keywords: Diesel Particulate Matter Dioctyl Phthalate Particles Exposure-levels Laboratory SMPS Metrological Assessment Monitors Nanoscan SMPS Nanotechnology Occupational Aerosol Particle Size Distribution Particulates Portable Analyzer Respirable-dust Total Particle Number Concentration Ultrafine Particles

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• Series:
  Mining Publications
• ISSN:
  0003-4878
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  OMSHR - Office of Mine Safety and Health Research
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  58
• Issue:
  7
• NIOSHTIC Number:
  nn:20044346
• Citation:
  Ann Occup Hyg 2014 Aug; 58(7):860-876
• Contact Point Address:
  Emanuele Cauda, National Institute for Occupational Safety and Health, Office of Mine Safety and Health Research, 626 Cochrans Mill Road, Pittsburgh, PA 15236
• Email:
  ecauda@cdc.gov
• Federal Fiscal Year:
  2014
• Peer Reviewed:
  True
• Source Full Name:
  Annals of Occupational Hygiene
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:f525ddd99a93776baa393c193ce4ce75a98ae2af58948012e1974f6b1513ff975faadd4efbd0c7fda5a28af3bffb63498e69c2bbd73469b544b538bff1c1a7e9
• Download URL:
  https://stacks.cdc.gov/view/cdc/228051/cdc_228051_DS1.pdf
• File Type:
  [PDF - 811.19 KB ]