Chlorine permissible exposure limits

Safety. Magnesium oxide (fume) has a permissible exposure limit (PEL) (134) (8 hours, TWA), of 10 mg/m total dust and 5 mg/m respirable fraction. Tumorigenic data (intravenous in hamsters) show a TD q of 480 mg/kg after 30 weeks of intermittent dosing (135), and toxicity effects data show a TC q of 400 mg/m for inhalation in humans (136). Magnesium oxide is compatible with most chemicals exceptions are strong acids, bromine pentafluoride, chlorine trifluoride, interhalogens, strong oxidizers, and phosphorous pentachloride. 

For worker exposure to trichloroethylene vapor, OSHA set a maximum eight-hour time-weighted average (TWA) concentration of 100 ppm. This severely restricted certain appHcations, and many organizations converted to other chlorinated solvents. As a result, U.S. production of trichloroethylene declined about 70% from a peak in 1970 (Table 2). In 1989, OSHA lowered the permissible exposure limit (PEL) from 100 ppm eight-hour TWA to 50 ppm eight-hour TWA (33). This added further pressure for some users to consider changing to alternative solvents. 

The Occupational Safety and Health Administration permissible exposure limits for various corrosives are as follows glacial acetic acid, 10 ppm acetic anhydride, 5 ppm hydrofluoric acid, 3 ppm sulfuric acid, lmgm oxalic acid, lmgm nitric acid, 2 ppm bromine, 0.1 ppm chlorine, Ippm fluorine, 1 ppm hydrochloric acid, 5 ppm. 

The Occupational Safety and Health Administration permissible exposure limit (OSHA PEL) for chlorodiphenyl (42% chlorine) is lmgm PEL — TWA, with skin notation. The OSHA PEL for chlorodiphenyl (54% chlorine) is 0.5mgm PEL — TWA, with skin notation. 

OSHA requires employers of workers who are occupationally exposed to PCBs to institute engineering controls and work practices to reduce and maintain employee exposure at or below permissible exposure limits (PELs). The employer must use engineering and work practice controls, if feasible, to reduce exposure to or below an 8-hour time-weighted average (TWA) of 1 mg/m for chlorodiphenyl (54% chlorine). Respirators must be provided and used during the time period necessary to install or implement feasible engineering and work practice controls (OSHA 1998a). 

Are employees aware of the hazards involved with the various chemicals they may be exposed to in their work environment, such as ammonia, chlorine, epoxies, caustics, etc. Are you familiar with the Threshold Limit Values or Permissible Exposure Limits of airborne contaminants and physical agents used in your workplace ... 

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