Respirator cartridge and canister efficiency studies with formaldehyde

Henry, Norman W.

doi:10.1080/15298668191420800

Cited by 1 publication

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“…The latter effect was also observed by M cDermot and Arnell 1954, Water vapour may, in addition, enhance adsorption by interacting with the adsorbate. Henry (1981) found that the breakthrough time for formaldehyde increased by about 50% when the relative humidity was increased to 80%, probably owing to the formation of a hydrated compound. Barnir and Aharoni (1975) observed that pre-adsorbed water increased the ad sorption of cyanogen chloride by causing hydrolysis of the adsorbate.…”

Section: Effec T Of H U M Id It Y O N P E R F O R M a N C E Of Ac Tivmentioning

confidence: 99%

“…Only canisters with about 10 times this quantity of carbon were able to give protection for a reasonable time against this compound. Henry (1981) measured the breakthrough times for formaldehyde vapour with a number of cartridge and canister respirators. Ordinary organic vapour respirator filters, containing carbon without impregnating agents, and challenged with approximately 3 ppm of formaldehyde vapour, gave breakthrough times (to 10%) at 30 to 130 min.…”

Section: A D S O R P T Io N Of Specific C O M P O U N D Smentioning

confidence: 99%

“…; ; ; ; ; ; ; ; ; Wood & Moyer (1989); ; ) Stampfer (1982; ; ; ; ; ; Jonas & Rehrmann (1974); ; ; ; ; ; ; ; ; ; ; ; ; ) Stampfer (1982; ; ; ; ; ; ; ; ; ; ; ; ) Henry (1981; ; ;…”

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Review: Activated Carbon Filters in Respiratory Protective Equipment

Brown

1995

International Journal of Occupational Safety and Ergonomics

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The review considers first the nature of airflow through granular carbon filters and the relationship between pressure drop and airflow rate. Equilibrium adsorption is then summarized, with particular emphasis on the volume filling of micropores, on which most of the theory of activated carbon performance is based. The dynamics of adsorption is studied, and the analytical solution of the fundamental dynamic adsorption equation is given, leading to the development of various equations used in practice for the description of breakthrough. The most fundamental dynamic parameter, the rate constant for adsorption, is discussed, and the effects of concentration, granule diameter, and air stream velocity are summarized. Extracts of a number of experimental observations with reference to specific adsorbates are given, followed by an account of the adsorption of mixtures of compounds. The effect of relative humidity is discussed. This is followed by an account of non-destructive tests, and the review ends with a summary and an indication of possible fruitful areas for research.

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Section: Effec T Of H U M Id It Y O N P E R F O R M a N C E Of Ac Tivmentioning

confidence: 99%

Section: A D S O R P T Io N Of Specific C O M P O U N D Smentioning

confidence: 99%