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Breakthrough time and adsorption capacity of respirator cartridges.
Am Ind Hyg Assoc J 1992 May; 53(5):303-316
The breakthrough time and adsorption capacity of respirator cartridges for organic vapors were examined. A previously derived mathematical equation that related breakthrough times to fractional breakthrough on respirator cartridges containing a carbon adsorbent was applied to adsorption data for 121 organic chemicals to calculate the time required for 50% breakthrough (T50), the weight of compound adsorbed at breakthrough percentages of 1, 10, and 100%, and times required for 1 and 10% breakthrough. The assault concentration of each chemical was 1000 parts per million (ppm), the temperature 22 degrees-C, and the flow rate 53 liters per minute. The calculated values were compared with experimental values where available. Calculated values of the rate constant for adsorption, T50, times required for 1 and 10% breakthrough, and the amount adsorbed at 1, 10, and 100% breakthrough were tabulated. The calculated values generally agreed well with the experimental values. The times for 1 and 10% breakthrough of methanol (67561) and methyl-chloride (74873) were negative indicating the breakthrough of these compounds occurred almost immediately and that charcoal was not a good sorbent for either. A more detailed analysis of the effect of the weight of adsorbed acetone (67641), benzene (71432), carbon-tetrachloride (56235), dichloromethane (75092), diethylamine (109897), hexane (110543), isopropanol (67630), methyl-acetate (79209), and methyl-chloroform (71556) on three types of carbon respirator cartridges using assault concentrations of 50 to 3000ppm was performed. Saturation capacity, as indicated by breakthrough, decreased with increasing assault concentration.
NIOSH-Publication; NIOSH-Grant; Respirators; Organic-vapors; Mathematical-models; Chemical-cartridge-respirators; Adsorbents; Surface-properties; Industrial-hygiene; Diffusion-analysis
67-56-1; 74-87-3; 67-64-1; 71-43-2; 56-23-5; 75-09-2; 109-89-7; 110-54-3; 67-63-0; 79-20-9; 71-55-6
Issue of Publication
American Industrial Hygiene Association Journal
Chemistry Ball State University Muncie, IN 47306
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division