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Carbon Monoxide

General Description

  • Synonyms: CO; Diesel Exhaust Component
  • OSHA IMIS Code Number: 0560
  • Chemical Abstracts Service (CAS) Registry Number: 630-08-0
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: FG3500000
  • Department of Transportation Regulation Number (49 CFR 172.101) and Emergency Response Guidebook: 1016 119; 9202 168 (cryogenic liquid)
  • NIOSH Pocket Guide to Chemical Hazards, Carbon Monoxide: chemical description, physical properties, potentially hazardous incompatibilities, and moree

Exposure Limits

  • OSHA Permissible Exposure Limit (PEL):
  • American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 25 ppm, 29 mg/m3 TWA
  • National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 35 ppm, 40 mg/m3 TWA; 200 ppm, 229 mg/m3 Ceiling

Health Factors

  • Potential Symptoms: Headaches; tachypnea; nausea; weakness, dizziness, confusion, halucinations; cyanosis; depressed, ST segment of electrocardiogram; angina; syncope
  • Health Effects: Asphyxiation, Chemical anoxia
  • Affected Organs: CVS, lungs, blood, CNS
  • Additional Information:
    • Occupational Health Guidelines for Chemical Hazards. US Department of Health and Human Services (DHHS), National Institute for Occupational Safety and Health (NIOSH) Publication No. 81-123, (1981, January). Provides a table of contents of guidelines for many hazardous chemicals. The files provide technical chemical information, including chemical and physical properties, health effects, exposure limits, and recommendations for medical monitoring, personal protective equipment (PPE), and control procedures.

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
  • Five Layer Aluminized Gas Sampling Bag (5 Liter)
  • maximum volume: 5 Liters
  • minimum volume: 2 Liters
  • maximum flow rate: 0.05 L/Min (TWA)
  • current analytical method: Gas Chromatography; GC/DID
  • method reference: OSHA Analytical Method (OSHA ID-210)
  • method classification: Fully Validated
  • note: Call the Salt Lake Technical Center (SLTC) Physical Measurements Team Leader for instructions.
On-Site Sampling Techniques/Methods:
  • Electrochemical sensor
  • manufacturer: Dräger
  • model/type: Model 190 CO Datalogger
  • sampling information: up to 8 hours
  • upper measurement limit: 999 ppm
  • detection limit: 4.1 ppm
  • overall uncertainty: 9.6%
  • method reference: OSHA On-site Air Method (OSHA ID-209)
Alternate Monitoring Method:

Yes, see Carbon Monoxide (by COHb)

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