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Chromium (II) Compounds (as Cr)

General Description

  • Synonyms: Chrome
  • OSHA IMIS Code Number: C121
  • Chemical Abstracts Service (CAS) Registry Number: 7440-47-3
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: GB4200000; 25915
  • Chemical Description and Physical Properties:
    • molecular weight: 52.00
    • molecular formula: Cr

Exposure Limits

  • OSHA Permissible Exposure Limit (PEL):
  • American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV) (1991) [as Cr, metal and Cr III compounds]: 0.5 mg/m3 TWA; A4
  • National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 0.5 mg/m3 TWA

Health Factors

  • NIOSH Immediately Dangerous To Life or Health Concentration (IDLH): 250 mg/m3
  • International Agency for Research on Cancer (IARC): Chromium and Chromium Compounds - Group 3, not classifiable as to its carcinogenicity to humans

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
  • See IMIS 0690, Chromium Sol. Chromic, Chromous Salts (as Cr)
  • See IMIS 0685, Chromium Metal and Insoluble Salts

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