Estimating Service Lives of Organic Vapor Cartridges III: Multiple Vapors at All Humidities

Details

• Personal Author:
  Snyder JL ; Wood GO
• Description:
  A published model for estimating service lives of organic vapor (OV) air-purifying respirator cartridges has been extended to include multiple organic vapors at all humidities. Equilibria among the OVs are calculated using Ideal Adsorbed Solution Theory, whereas the effects of adsorbed water are considered as due to micropore volume exclusion. Solubilities of OVs in water must also be taken into account. Adsorption kinetics of components of mixtures are based on published correlations of the effects of covapors and water vapor. The dynamics of adsorption and competition are incorporated using expanding zones within the carbon bed, taking into account vapor and water displacements. Measurements of breakthrough curves for two ternary OV mixtures at high humidities have been done for a single cartridge type. The service life estimation model, implemented as a spreadsheet and a computer program, has been tested against these data as well as data for OV mixtures from literature sources. Good agreements were obtained between model predictions and experimental breakthrough times at dry conditions and humid conditions. [Description provided by NIOSH]
• Subjects:
  Absorptiometry, Photon Air Pollutants, Occupational Humidity Occupational Health Respiratory Protective Devices Respiratory System Safety
• Keywords:
  Absorptiometry Absorption-rates Air-purification Air-purifiers Air-purifying-respirators Mathematical-models Models Organic-vapors Respiration Respirators Statistical-analysis

  More +
• ISSN:
  1545-9624
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  New Mexico ; OSHA Region 3 ; OSHA Region 6 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  NPPTL - National Personal Protective Technology Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  363-374
• Volume:
  4
• Issue:
  5
• NIOSHTIC Number:
  nn:20032158
• Citation:
  J Occup Environ Hyg 2007 May; 4(5):363-374
• Contact Point Address:
  Gerry O. Wood, 40 San Juan Street, Los Alamos, NM 87544
• Email:
  GerryConsulting@cs.com
• Federal Fiscal Year:
  2007
• NORA Priority Area:
  All Sectors
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Occupational and Environmental Hygiene
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:4ec51854c1a071526745994ebcac1bb493c05ed1b8b55ccf06c9b451c01a889b2350dee27e2633817b61837307a392ad6c740e22a275e201e87110b7a457bab1
• Download URL:
  https://stacks.cdc.gov/view/cdc/186202/cdc_186202_DS1.pdf
• File Type:
  [PDF - 1.80 MB ]