A Cyclone for End of Shift Silica Measurement

Details

• Personal Author:
  Cauda, Emanuele G. ; Harper M ; Hummer J ; Lee L ; Lee T ; Soo J
• Description:
  Objective: 1) To develop a respirable size selective sampler for direct-on-filter silica measurement at the End of Shift (EOS) using a portable Fourier transform infrared spectrometer, and 2) to determine its size selective sampling performance compared to international standards respirable convention. Methods: A new cyclone, based on the concept of the GS3 respirable dust cyclone, was designed to use a 25-mm filter holder with an effective dust deposition diameter of approximately 8.5 mm. The new sampler (EOS cyclone) was constructed using a 3 dimensional printer loaded with ABS-M30 material. Sampling efficiency of the EOS cyclone was determined using polydisperse glass sphere particles and a time of flight real time direct reading instrument (Aerodynamic Particle Sizer). The test aerosol was generated with a fluidized aerosol generator and the aerosol was introduced into a calm air chamber. The EOS cyclone and a reference sampler were placed horizontally inside the chamber positioned at the same sampling plane. The flow rates of the reference sampler were the same as the test cyclone and the inlet diameter for the reference sampler was calculated so as to obtain a representative sample of the aerosol in calm air conditions. Five EOS cyclones were tested at flow rates of 1.1 and 1.2 l min-1. Using the bias map approach, the measured performance for the EOS cyclone was assessed against the respirable convention defined in American Conference of Governmental Industrial Hygienists (ACGIH)/Comite Europeen de Normalisation (CEN)/International Standards Organization (ISO). Results: Sampling efficiency of newly developed EOS cyclone was determined. Average cut off diameters of the EOS cyclone at flow rates of 1.1 and 1.2 l min-1 were 4.4+/-0.06 and 4.1+/-0.15 um, respectively. Bias of the EOS cyclone ranged -4-10% at 1.1 l min-1 and -16-4% at 1.2 l min-1. Coal mine dust was used to assess the deposition area on the filter; the preliminary assessment showed an area with an 8.7 mm diameter. Conclusions: The newly developed EOS cyclone showed minimum bias compared to the international standard respirable convention with flow rates of 1.1 or 1.2 l min-1. The cyclone will be further investigated for direct on filter silica measurement with coal and non-coal mine dusts using a portable Fourier Transform infrared spectrometer. [Description provided by NIOSH]
• Subjects:
  Aerosols Environmental Monitoring Occupational Health Particulate Matter Safety Silicon Dioxide
• Keywords:
  Air Samplers Air Samples Air Sampling Equipment Coal Dust Cyclone Air Samplers Filters Particulates Silica Silica Dusts
• Series:
  Mining Publications
• Publisher:
  American Industrial Hygiene Association
• Document Type:
  Text
• Genre:
  Abstract or Summary
• Place as Subject:
  Maryland ; OSHA Region 3 ; Pennsylvania ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division ; PMRD - Pittsburgh Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  3
• NIOSHTIC Number:
  nn:20048246
• 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; :3
• CAS Registry Number:
  Silica (CAS RN 7631-86-9)
• 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:e0648e916a1e760ac5691d72489ada47be103b5ca3f304c921182dcc91dfa8ba9984ea6bb05c46a32ce977d62e58abe472a464e6d2eb19bf5ed79a47d7dce11b
• Download URL:
  https://stacks.cdc.gov/view/cdc/228260/cdc_228260_DS1.pdf
• File Type:
  [PDF - 3.34 MB ]