Unipolar charging based, hand-held mobility spectrometer for aerosol size distribution measurement

Details

• Personal Author:
  Kulkarni P ; Qi C
• Description:
  A hand-held particle size spectrometer for monitoring workplace exposure to aerosols and nanoparticles with 13 channels in the15-630 nm has been described.The instrument uses electrical mobility-based size classification in which aerosol particles are electrically charged using a unipolar corona charger, followed by classification in a condenser-type disk classifier, and particle counting using a commercial handheld condensation particle counter (CPC; Model 3007,TSI Inc.,Shoreview, MN). An unipolar charger was designed to reduce multiple charging of particles which helped extend the measurable size range.The electrical classifier, which served as a low-pass mobility filter,was operated at 2:1sheath-to-aerosol flow ratio using a single pump inside the CPC. An inversion scheme was developed to obtain discrete size distributions from cumulative mobility distributions. The sizing accuracy was also experimentally investigated using DMA-classified, near-monodisperse particles and was found to be in the range 1.4-8.1% below 300 nm, and increased to 13.6% for 500 nm particle. Experimentally measured sizing uncertainties ranged from 78-114%.The counting uncertainties of the instrument were in the range 0.1-10.5% for typical concentration range for ambient and workplace aerosols. Size distributions of test unimodal and bimodal polydisperse aerosols measured using HPSS agreed reasonably well with that from the laboratory scanning mobility spectrometer. HPSS can be useful in many routine monitoring applications, though the measured uncertainties can be large for some applications. [Description provided by NIOSH]
• Subjects:
  Aerosols Occupational Health Particulate Matter Safety Spectrum Analysis Workplace
• Keywords:
  Aerosol Mobility Spectrometer Author Keywords: Nanoparticle Size Distribution Exposure-levels Exposure-limits Monitoring-systems Monitors Nanoparticle Exposure Nanotechnology Particulate-dust Particulates Portable Aerosol Instrumentation Spectrographic-analysis Work-environment

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• ISSN:
  0021-8502
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  32-47
• Volume:
  49
• Issue:
  1
• NIOSHTIC Number:
  nn:20040553
• Citation:
  J Aerosol Sci 2012 Jul; 49(1):32-47
• Contact Point Address:
  Pramod Kulkarni, Center for Disease Control and Prevention, National Institute for Occupational Safety and Health, 4676 Columbia Pkwy, MS; R7, Cincinnati, OH 45226
• Email:
  PSKulkarni@cdc.gov
• Federal Fiscal Year:
  2012
• NORA Priority Area:
  Manufacturing
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Aerosol Science
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:ce3830fb3b03e57172cbb77cc846c07c7b3be6bb4484ab10120d54edf0efd873dd389fdd1a2264a9996bae9b9ee692a4f7fae158382a8ed938b8b103c05b3789
• Download URL:
  https://stacks.cdc.gov/view/cdc/193362/cdc_193362_DS1.pdf
• File Type:
  [PDF - 1.27 MB ]