| Document ID (ISN) | 68809 |
| CIS number |
97-566 |
| ISSN - Serial title |
0019-8366 - Industrial Health |
| Year |
1996 |
| Convention or series no. |
|
| Author(s) |
Tanaka S., Taneka M., Kimura K., Nozaki K., Seki Y. |
| Title |
Breakthrough time of a respirator cartridge for carbon tetrachloride vapor flow of workers' respiratory patterns |
| Bibliographic information |
22 Apr. 1996, No.34, p.227-236. Illus. 17 ref. |
| Abstract |
Breakthrough times of a commercially-available respirator cartridge packed with a small amount of activated carbon were determined with three different flow patterns: workers' respiratory patterns, conventional steady-state flows, and three standard patterns consisting of square, sine and sawtooth waves. A mechanical breathing simulator was used to reproduce the three standard wave patterns as well as the workers' respiratory patterns, which had been recorded from three workers wearing a gas mask equipped with a respirator cartridge. The breakthrough test was carried out with 300ppm carbon tetrachloride vapour at average flow rates of the respiratory and standard patterns equivalent to the steady-state flow rates. The breakthrough times for the simulated workers' respiratory patterns were shorter than those for a steady-state flow at the equivalent flow rate, and to be as short as those for sine and sawtooth wave patterns. The shorter breakthrough times for the workers' respiratory patterns could be attributed to a faster maximum inspiratory flow rate than that in the case of steady-state flow. This suggests that the transit time of carbon tetrachloride molecules through the thin activated carbon layer of the respirator cartridge may be too short to permit attainment of adsorption equilibrium. |
| Descriptors (primary) |
gas removing respirators; Japan; service life; sorbent filters; carbon tetrachloride |
| Descriptors (secondary) |
experimental determination |
| Document type |
D - Periodical articles |
| Country / State or Province | Japan |
| Subject(s) |
Personal protection
|
| Broad subject area(s) |
Chemical safety
|
| Browse category(ies) |
Respiratory protection
Halogenated hydrocarbons
|
