NIOSHTIC-2 Publications Search
Estimating service lives of organic vapor respirator cartridges for multiple vapors at all humidities.
Wood G; Snyder J
American Industrial Hygiene Conference and Exposition, May 21-26, 2005, Anaheim, California. Fairfax, VA: American Industrial Hygiene Association, 2005 May; :27
A recently-published model for estimating service lives of organic vapor (OV) air-purifying respirator cartridges [Wood, JOEH 1:472-492 (2004] has been extended to include multiple organic vapors at all humidities. Equilibriums among the OVs are calculated using Ideal Adsorbed Solution Theory, while 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 include published effects of covapors and water vapor. The dynamics of adsorption and competition are incorporated using expanding zones, taking into account vapor and water displacements and rollups. A large number of measurements of breakthrough curves for OV mixtures at various humidities and for a single cartridge type have been done at NIOSH/NPPTL and by a contractor. The model, implemented as a spreadsheet and a computer program, has been tested against these data.
Organic-vapors; Models; Air-purifying-respirators; Air-purifiers; Air-purification; Respirators; Respiration
Research Tools and Approaches: Control Technology and Personal Protective Equipment
American Industrial Hygiene Conference and Exposition, May 21-26, 2005, Anaheim, California
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division