Cobalt and Cobalt Compounds

Date Added

Air

Hot Spots Unit Risk and Cancer Potency values

Cobalt metal and water-insoluble cobalt compounds

Unit Risk Factor: 7.7 × 10–3 (µg/m3)–1

Inhalation Slope Factor: 27 (mg/kg-day)–1

Water-soluble cobalt compounds (normalized to cobalt content)

Unit Risk Factor: 1.0 × 10–2 (µg/m3)–1

Inhalation Slope Factor: 35 (mg/kg-day)–1

Air Toxics Hot Spots Notice

Notice of Adoption of Revised Cancer Inhalation Unit Risk Factors for Cobalt Sulfate Heptahydrate and Water-Soluble Cobalt Compounds