CAS No. 7440-48-4
Cobalt (Co) is a hard, gray metal that occurs naturally. It is found in rocks, soil, water, plants, and animals, including people. It can harm the eyes, skin, heart, and lungs. Exposure to cobalt may cause cancer. Workers may be harmed from exposure to cobalt and cobalt-containing products. The level of harm depends upon the dose, duration, and work being done.
Cobalt is used in many industries. It’s used in cutting and grinding tools, pigments and paints, colored glass, surgical implants, batteries, and some electroplating. Its radioactive isotope is used in imaging and food irradiation. Some examples of workers at risk of being exposed to cobalt include the following:
- Workers who work in industries processing cobalt-alloys
- Miners who work in the metal mining industries
- Workers involved in the production or use of cutting or grinding tools
- Employees who work at nuclear or irradiation facilities
NIOSH recommends that employers use Hierarchy of Controls to prevent injuries. If you work in an industry that uses cobalt, please read chemical labels and the accompanying Safety Data Sheets for hazard information. Visit NIOSH’s page on Managing Chemical Safety in the Workplace to learn more about controlling chemical workplace exposures.
The following resources provide information about occupational exposure to cobalt. Useful search terms for cobalt include “cobalt metal dust,” “cobalt metal powder,” “cobalt metal fume,” and “elemental cobalt.”
NIOSH Chemical Resources
The NIOSH Pocket Guide to Chemical Hazards (NPG) helps workers, employers, and occupational health professionals recognize and control workplace chemical hazards.
The NIOSH Manual of Analytical Methods (NMAM) is a collection of methods for sampling and analysis of contaminants in workplace air, and in the blood and urine of workers who are occupationally exposed.
Related NIOSH Resources
- NIOSHTIC-2 search results on cobalt—NIOSHTIC-2 is a searchable database of worker safety and health publications, documents, grant reports, and journal articles supported in whole or in part by NIOSH.
- Immediately Dangerous to Life or Health (IDLH) Values of Cobalt Metal Dust and Flame—NIOSH reviews relevant scientific data and researches methods for developing IDLH values.
- NIOSH Worker Health Study Summaries—NIOSH conducts research to prevent illnesses and injuries in the workplace. The NIOSH Worker Notification Program notifies workers and other stakeholders about the findings of these research studies.
- NIOSH Occupational Hazard Assessment: Criteria for Controlling Exposure to Cobalt—DHHS (NIOSH) Publication No. 82-107. This report increases awareness and recommends work practices to reduce exposure to the toxic effects of cobalt and degree of worker exposure to substances containing cobalt.
- Elements by ICP (7300)—Sampling and measurement data from NMAM, fourth edition.
- Cobalt and Compounds (7027)—Sampling and measurement data from NMAM, fourth edition.
- Specific Medical Tests or Evaluations Published in the Literature for OSHA-Regulated Substances: Cobalt Metal, Dust, and Fume —DHHS (NIOSH) Publication No. 2005-110 (2004)
- Occupational Health Guideline for Cobalt Metal Fume and Dust—This guideline helps stakeholders conduct effective occupational safety and health programs.
- ASTDR ToxFAQs for Cobalt
- ATSDR Toxicological Profile for Cobalt
- EPA Chemistry Dashboardexternal icon
- EPA Hazard Summary: Cobalt Compoundsexternal icon
- EPA Radionuclide Basics: Cobalt-60external icon
- NLM Haz-Map: Cobaltexternal icon
- NLM MedlinePlus: Cobalt Poisoningexternal icon
- NLM TOXNET: Cobalt, Elementalexternal icon
- NOAA Cameo Chemicals: Cobaltexternal icon
- NTP Review of the Toxicological Literature: Cobalt Dustexternal icon
- NTP Report on Carcinogens: Cobalt and Cobalt Compoundsexternal icon
- OSHA eTools: Sawmills > Cobalt Dustexternal icon
- OSHA Hazard Communicationexternal icon
- OSHA Occupational Chemical Database: Cobalt Metal (Dust & Fume)external icon
- New Jersey Hazardous Substance Fact Sheet: Cobaltexternal icon
- Texas Health and Human Services Fact Sheet: Cobaltexternal icon
- Canadian Centre for Occupational Health and Safety (CCOHS): Cobaltexternal icon
- European Chemicals Agency (ECHA): Cobaltexternal icon
- Gestis Substance Databaseexternal icon
- IARCH Monograph (Volume 86): Cobaltexternal icon
- International Chemical Safety Card (ICSC): Cobaltexternal icon
- IPCS INCHEM: Criteria Document for Swedish Occupational Standards: Cobalt and Cobalt Compoundsexternal icon
- IPCS INCHEM: OECD SIDS Initial Assessment Report: Tungsten Carbide (contains Cobalt binder)external icon
- OECD Global Portal to Information on Chemical Substancesexternal icon
- United States Global Survey (USGS): Cobalt Statistics and Informationexternal icon
- WHO (CICADS) 69: Cobalt and Inorganic Cobalt Compoundsexternal icon