Evaluation of new in-facepiece sampling procedures for full and half facepieces

Details

• Personal Author:
  Hornung, Richard W. ; Myers WR
• Description:
  The bias and precision associated with five new in/face respirator sampling procedures was evaluated. The procedures evaluated consisted of a continuous, low sampling rate flush on the respirator midnose and mouth probing (CLF) procedure; a continuous, high sampling rate deep front of mouth probing (CHD) procedure; a pushed exhalation, deep front of mouth probing (PED) procedure; an exhalation valve discharge (EVD) procedure; and a pulsed inhalation, deep front of mouth pushing (PID) procedure. The CLF procedure was the recommended methodology for sampling respirator facepieces in the United States. The procedures were evaluated using nine full facepieces and five half facepieces. All facepieces were normally equipped with organic vapor cartridges and were NIOSH certified. The full facepieces did not have nose cups. The facepieces were punctured at three sites to generate leaks corresponding to penetrations of 1 or 0.1% and mounted on a specially designed respirator/simulated breathing test system. Acetone vapor was used as the test agent. The amounts of acetone vapor passing through the leaks were measured using the CLF, CHD, PED, EVD, and PID. The bias for each procedure was determined as the difference between the true acetone concentration and the concentrations measured inside the facepieces. Precision was estimated using a modified analysis of variance technique. The average sampling biases on the full facepieces obtained with the CLF, CHD, PED, EVD, and PID procedures were -21, -3, 0.7, -14, and -12.3%, respectively. The corresponding biases on the half facepieces were -26, -13, -4, -2, and -24%. The precision of the measurements obtained on the full facepieces by the CLF, CHD, PED, EVD, and PID procedures were 14.0, 11.8, 5.0, 11.9, and 21.0%, respectively. The values obtained on the half facepieces were 14.0, 11.7, 5.8, 3.0, and 29.2%, respectively. The authors conclude that based on the results obtained with the full facepieces the PED is the best procedure and the CLF procedure the worst. [Description provided by NIOSH]
• Subjects:
  Laboratories Occupational Health Personal Protective Equipment Respiratory Protective Devices Safety
• Keywords:
  Chemical-cartridge-respirators Industrial-hygiene Laboratory-testing NIOSH-Author Respiratory-protective-equipment Sampling-methods Statistical-analysis
• ISSN:
  0003-4878
• Document Type:
  Text
• Genre:
  Journal Article
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  151-166
• Volume:
  37
• Issue:
  2
• NIOSHTIC Number:
  nn:00216104
• Citation:
  Ann Occup Hyg 1993 Apr; 37(2):151-166
• Federal Fiscal Year:
  1993
• 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:b66f8de5340852660ee6df8ee88b2765f8091965308c9c699711946a784b7c42c196ee56249d660ecf4f3a16bc481797a2d82f40814bb81b08405695158c0e4e
• Download URL:
  https://stacks.cdc.gov/view/cdc/204684/cdc_204684_DS1.pdf
• File Type:
  [PDF - 1.20 MB ]