Cobalt (CAS 7440-48-4; Co) is a grey metal that exists in a number of oxidation states, including divalent (Co[II]) and trivalent (Co[III]) oxidation states.

Examples of work activities involving cobalt and its compounds that may require special attention include:

• electroplating
• refining or processing alloys
• in nickel-metal hydride batteries
• as a colorant in glazes for arts and crafts including glass, ceramics and paints

This guide provides information for those registered medical practitioners engaged by a PCBU to carry out or supervise health monitoring for workers. This guidance should be read in conjunction with the following:

• Health monitoring guide for registered medical practitioners
• Health monitoring guides for hazardous chemicals
• Health monitoring guide for persons conducting business or undertakings (PCBUs)