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Chemical Sampling Information (CSI)
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General Description

Synonyms: Osmic acid

OSHA IMIS Code Number: 1960

Chemical Abstracts Service (CAS) Registry Number: 20816-12-0

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: RN1140000

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: 2471 55

Chemical Description and Physical Properties:

colorless to pale yellow solid with an odor like chlorine; sharp and choking
molecular weight: 254
vapor pressure: 11 mm at 27°C
boiling point: 130°C (Sublimes well below BP)
melting point: 40.6°C

Incompatibilities: Hydrochloric acid, easily oxidized organic materials

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 0.002 mg/m3

Construction Industry: 0.002 mg/m3 TWA

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 0.0002 ppm, 0.0016 mg/m3 TWA; 0.0006 ppm, 0.0047 mg/m3 STEL

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 0.0002 ppm TWA; 0.0006 ppm STEL

Health Factors

Potential Symptoms: Lacrimation, vision disturbance, conjunctivitis; headaches; coughing, dyspnea; dermatitis

Health Effects: Irritation-Eye, Nose, Throat, Skin---Marked (HE14) Lung edema (HE11)

Affected Organs: Eyes, respiratory system, skin

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • note: Call the Salt Lake Technical Center.

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