High flow rate thoracic size selective samplers

Details

• Personal Author:
  Harper M ; Lee T
• Description:
  Objective: To calibrate high flow rate thoracic size selective samplers (GK4.126 and FSP10), which can be used for dual fraction size selective sampling to measure the respirable and thoracic size fractions. Methods: Six different sizes of monodisperse ammonium fluorescein aerosols were generated using a vibrating orifice aerosol generator. Airborne particles were collected with samplers in a cylindrical calm air test chamber. After sampling, the fluorescent intensity was measured using a luminescence spectrometer. Because the size interval of the Aerodynamic Particle Sizer for particles > 8 um is large (> 0.6 um), projected area diameters of the monodisperse ammonium fluorescein particles were measured with a field emission scanning electron microscopy. At least 100 particles of projected area diameters were measured for each particle size. Equivalent volume diameter was calculated using average project area diameters. From equivalent volume diameter, an aerodynamic diameter was calculated with the particle's specific gravity and dynamic shape factor. Three repetitions with each sampler units were conducted at each size of particle size. The measured performance data for the cyclone was assessed against the thoracic target convention defined in American Conference of Governmental Industrial Hygienists (ACGIHR)/Comite Europeen de Normalisation (CEN)/ International Standards Organization (ISO). Results: The measured cut off diameters (d50s) for the GK2.69, GK4.126 and FSP10 cyclones were 9.7, 9.8, and 10.9 um, respectively. Bias maps for the cyclones were generated from the measured sampling efficiency compared to the ACGIH/ CEN/ISO thoracic convention for a range of mass median aerodynamic diameter 1-30 um with geometric standard deviation of 1.5-4. The GK2.69 cyclone was tested at a flow rate of 1.6 l min-1 as a reference sampler for comparison and its performance was similar to that observed in a previous study. The estimated biases for the measured experimental GK2.69 cyclone performance compared with ACGIHR/CEN/ISO thoracic convention were negative up to 25 % while those of the GK4.126 and FSP10 cyclones were positive up to 7 and 11 %, respectively. Conclusions: High flow rate cyclones normally used for respirable size selective sampling were calibrated to measure the thoracic size fraction. The recommended flow rates of GK4.126 and FSP10 cyclones for thoracic size selective sampling are 3.5 and 4.0 l min-1, respectively. Higher flow rate samplers will collect more sample for subsequent analysis resulting in an increase in sensitivity making them more useful for the measurement of low concentration aerosols or during short term or task specific sampling. The cyclones should be further investigated for sampling of specific occupational aerosols. [Description provided by NIOSH]
• Subjects:
  Aerosols Air Pollutants, Occupational Environmental Monitoring Occupational Health Particulate Matter Safety
• Keywords:
  Airborne Particulates Air Samplers Air Samples Air Sampling Equipment Ammonium Compounds Cyclone Air Samplers Filters Luminescence Particulates
• Publisher:
  American Industrial Hygiene Association
• Document Type:
  Text
• Genre:
  Abstract or Summary
• Place as Subject:
  Maryland ; OSHA Region 3 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  4
• NIOSHTIC Number:
  nn:20048247
• Citation:
  AIHce 2016: American Industrial Hygiene Conference and Exposition Pathways to Progress, May 21-26, 2016, Baltimore, Maryland. Falls Church, VA: American Industrial Hygiene Association, 2016 May; :4
• Federal Fiscal Year:
  2016
• NORA Priority Area:
  Mining
• Peer Reviewed:
  False
• Source Full Name:
  AIHce 2016: American Industrial Hygiene Conference and Exposition Pathways to Progress, May 21-26, 2016, Baltimore, Maryland
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:907e3789c0aac04bd64d414d9802e6b2b22e72d60ea6c74ef71f8781f425f58830883d5fd68f5f7007d52525bf69fe9c8ae99b002f20c81064dd5037c7b8b92b
• Download URL:
  https://stacks.cdc.gov/view/cdc/203052/cdc_203052_DS1.pdf
• File Type:
  [PDF - 1.49 MB ]