Cobalt and Cobalt Compounds
IRIS Assessment Plan and Protocol for Assessing Cancer Risk from Inhalation Exposure to Cobalt and Cobalt Compounds (Scoping and Problem Formulation Materials)
U.S. EPA. IRIS Assessment Plan and Protocol for Assessing Cancer Risk from Inhalation Exposure to Cobalt and Cobalt Compounds (Scoping and Problem Formulation Materials). U.S. Environmental Protection Agency, Washington, DC, EPA/635/R-22/248, 2022.
Cobalt is a metallic element that is naturally occurring as several different substances and oxidation states, often in association with nickel, silver, lead, copper, and iron ores. Cobalt compounds represent a large group of substances and are used in a variety of industrial applications including as a colorant for glass, ceramics, and paint; as driers for inks and paints; as catalysts; and in feed supplements and batteries. Cobalt is also used in alloys or composites. The cancer assessment of water-soluble and water-insoluble cobalt compounds is focused on inhalation exposure from emissions to air during industrial processes and those cobalt forms most pertinent to implementing the Clean Air Act (CAA).
|Nov 2022||EPA released the draft IRIS Assessment Plan and Protocol for Assessing Cancer Risk from Inhalation Exposure to Cobalt and Cobalt Compounds for a 30-day public comment and review period. [Federal Register Notice Nov 14, 2022]|
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Comments on the assessment may be submitted and reviewed using the Docket ID EPA-HQ-ORD-2022-0833