NIOSH Recommendations

Analytical Methods. The official NIOSH recommended method for determining sulfur dioxide in air consists of drawing a known prefiltered volume of air through a bubbler containing hydrogen peroxide, thus oxidising the sulfur dioxide to sulfuric acid. Isopropyl alcohol is then added to the contents in the bubbler and the pH of the sample is adjusted with dilute perchloric acid. The resultant solution is then titrated for sulfate with 0.005 M. barium perchlorate, and Thorin is used as the indicator. 

The NIOSH recommended exposure limit for carcinogenic hexavalent chromium is 1 lg/m Cr(VI) as a 10-h TWA, and for noncarcinogenic Cr(VI) the 10-h TWA is 25 lg/m Cr(VI), including a 15-min maximum exposure of 50 lg/m Cr(VI). According to NIOSH, the noncarcinogenic Cr(VI) compounds are chromic acid and the chromates and dichromates of sodium, potassium, lithium, mbidium, cesium, and ammonia. NIOSH considers any hexavalent chromium compound that does not appear on the preceding Hst carcinogenic (145). 

NIOSH Ceiling Limit (NIOSH CL) NIOSH-recommended l5-min e.xposure limit, which should not be exceeded. 

NIOSH recommends that a person not be exposed in the workplace to more than 0.2 mg/m of methyl parathion for a 10-hour workday, 40-hour workweek. 

In terms of toxicity, NIOSH recommends that endosulfan be recognized as a Group 1 Pesticide (NIOSH 1992). Pesticides in Group 1 pose a significant risk of adverse acute health effects at low concentrations or carcinogenic, teratogenic, neurotoxic, or reproductive effects (NIOSH 1992). 

NIOSH. 1992. NIOSH recommendations for Occupational Safety and Health. Compendium of Policy Documents and Statements. U.S. Department of Health and Human Services. Public Health Services. Centers for Disease Control. National Institute for Occupational Safety and Health. Publication no. 92-100. Cincinnati, Ohio. 

Substance for which the TLV is higher than the OSHA Permissible Exposure Limit (PEL) and/or the NIOSH Recommended Exposure Limit (REL). Simple asphyxiant. Some gases and vapours present at high concentrations act as asphyxiants by reducing the oxygen content of air. Many of these are odourless and colourless. Many also pose a fire or explosion risk, often at values below which asphyxiation can occur. (Although capable of asphyxiation, they are not considered to be substances hazardous to health under COSHH.)... 

Mineral oil is the major chemical component of mineral oil hydraulic fluids. Mineral oil belongs to a larger class of chemicals called petroleum distillates. The Occupational Safety and Health Administration (OSHA) regulates petroleum distillate and mineral oil mist levels in workplace air. The occupational exposure limits for an 8-hour workday, 40-hour workweek are 2,000 milligrams per cubic meter (mg/m3) in air for petroleum distillates and 5 mg/m3 for mineral oil mists. The National Institute for Occupational Safety and Health (NIOSH) recommends an exposure limit of 350 mg/m3 of petroleum distillates for a 10-hour workday, 40-hour workweek. 

Personal Protective Equipment Phosgene is a severe respiratory tract and skin irritant, and contact with the liquid will cause frostbite. Respiratory protection requires positive-pressure-demand, self-contained breathing apparatus (SCBA), while skin protection requires chemical-protective clothing since phosgene gas can cause skin irritation and burns. NIOSH recommends protective suits from Responder (Kappler Co.), Tychem 10000 TM (DuPont Co.) or Teflon (DuPont Co.). 

National Institute for Occupational Safety and Health (NIOSH), 21 593. See also NIOSH Recommended Exposure Limit (REL)... 

NIOSH Recommended Exposure Limit (REL) for Occupational Exposure Hexane TWA 50 ppm (180 mg/m3) NIOSH 1992... 

NIOSH Recommended Exposure Limit for Occupational exposure (TWA) 0.1 mg/m3 (skin) (6.4x10 3 ppm) NIOSH 1992... 

NIOSH. 1992. NIOSH recommendations for occupational safety and health, compendium ofo policy documents and statements. Cincinnati, OH. 

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