Gas masks, use

Gas masks used by firefighters often contain potassium superoxide, KO2. KO2 reacts with carbon dioxide and water in exhaled breath to produce oxygen by the following reaction ... 

What inspect gas masks used for protection against suifurous acid and chiorine gases as specified under 29 CFR 1910.134, Respiratory... 

The gas-adsorptive properties of wood charcoal were recognized as early as 1773 by Scheele (Deitz, 1944) however, it was not until the middle of the nineteenth century that the property was utilized commercially. This application consisted of the use of charcoal air-filters in the ventilation and disinfection of sewers (Stenhousc, 1961). The next major step in the development of active carbon for gas ad.sorption occurred during World War I, when the use of poison gas by the Germans made it necessary to develop a hard, granular carbon for gas-mask use. 

Storage, Shipping, and Handling. Phosphoms pentachloride is in the EPA extreme ha2ardous substance Hst. It is treated as a dammable sohd, and containers in which it is stored or shipped must be affixed with a yellow acid label DOT UN No. 1806. In general, the pentachloride should be handled with the same precautions that are used with the trichloride. Protective clothing should be worn by workers handling the pentachloride and gas masks should be used when personnel are exposed to the vapors. 

Oxidation. Carbon monoxide can be oxidized without a catalyst or at a controlled rate with a catalyst (eq. 4) (26). Carbon monoxide oxidation proceeds explosively if the gases are mixed stoichiometticaHy and then ignited. Surface burning will continue at temperatures above 1173 K, but the reaction is slow below 923 K without a catalyst. HopcaUte, a mixture of manganese and copper oxides, catalyzes carbon monoxide oxidation at room temperature it was used in gas masks during World War I to destroy low levels of carbon monoxide. Catalysts prepared from platinum and palladium are particularly effective for carbon monoxide oxidation at 323 K and at space velocities of 50 to 10, 000 h . Such catalysts are used in catalytic converters on automobiles (27) (see Exhaust CONTHOL, automotive). 

Prevention of carbon monoxide poisoning is best accompHshed by providing good ventilation where contamination is a problem. If good ventilation is not possible, a self-contained breathing apparatus, such as a Scott Air-Pak, must be used. The use of gas masks containing an adsorbent is generally not recommended since it is difficult to know when the adsorbent is exhausted. 

Entry into a tank that has contained any chlorinated or any easily evaporated solvent requires special procedures to ensure worker safety. The heavier vapors tend to concentrate in unventilated spaces. The proper tank entry procedure requires positive ventilation, testing for residue solvent vapor and oxygen levels, and the use of respiratory equipment and rescue harness. Monitoring the tank from outside is also important. The use of an appropriate gas mask is permissible in vapor concentrations of less than 2% and when there is no deficiency of atmospheric oxygen, but not for exposures exceeding one-half hour. Skin exposure to 1,1,1-trichloroethane can cause irritation, pain, bHsters, and even burning. Eye exposure may produce irritation, but should... 

Uses. Potassium peroxide is used as an oxidizing agent and in oxygen generating units for gas masks (Ref 5). Another use has been found by Hatterer who developed a device which extracts the thermal energy from nuclear reactors in a reaction which generates H2 and 02 gases by... 

RESPIRATORY PROTECTION CONCENTRATION RESPIRATORY PROTECTIVE EQUIPMENT < 5.2 (as mixture i.e., 3.7 mg/m3 DETA and 1.5 mg/m3 EGME)NIOSH approved full face piece respirators with an organic vapor canister will be on hand for escape. (M9, M17, M40 series gas masks are acceptable for this purpose. Other masks certified as equivalent maybe used.) NIOSH approved escape type SCBA can also be used >5.2 or concentration unknownNIOSH approved full face piece pressure demand SCBA. Or NIOSH approved full-face piece positive pressure, supplied-air respirators with auxiliary SCBA... 

The most painful loss I ve experienced, partly as a result of my health, was the loss of a twenty-three-year relationship that I thought would last forever. In one of our last counseling sessions together my partner said, He s running around with people wearing gas masks, for God s sake He also told the woman who cleaned our house that she could go back to using a disinfectant on the floors. It was... 

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