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Breakthrough time and adsorption capacity of respirator cartridges.

Authors
Yoon-YH; Nelson-JH
Source
Am Ind Hyg Assoc J 1992 May; 53(5):303-316
NIOSHTIC No.
00207515
Abstract
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.
Keywords
NIOSH-Publication; NIOSH-Grant; Respirators; Organic-vapors; Mathematical-models; Chemical-cartridge-respirators; Adsorbents; Surface-properties; Industrial-hygiene; Diffusion-analysis
CODEN
AIHAAP
CAS No.
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
Publication Date
19920501
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R03-OH-002660
Issue of Publication
5
ISSN
0002-8894
Priority Area
Respirator Research
Source Name
American Industrial Hygiene Association Journal
State
IN
Performing Organization
Chemistry Ball State University Muncie, IN 47306
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