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Environmental fate & pathways

Henry's Law constant

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Description of key information

No volatilization potential.

Key value for chemical safety assessment

Additional information

a) The inorganic component (cobalt) is not volatile.

b) The organic component (acetic acid CAS: 64-19-7) is also not volatile (H = 0.0555261 Pa*m³/mole at 25°C).

Summary according the volatilization potential of cobalt and cobalt compounds and its atmospheric behavior, as given in CICAD 69 (WHO 2006)

Cobalt and inorganic cobalt compounds are nonvolatile. Therefore, they are released into the atmosphere in particulate form. Atmospheric transport depends on particle size and density and meteorological conditions. Coarse particles with diameters >2 μm may deposit within 10 km from the point of emission, while smaller particles may travel longer distances. The mass median diameter of atmospheric cobalt was found to be 2.6 μm in one study (Milford & Davidson, 1985). Data on the transformations of cobalt in the atmosphere are limited. Anthropogenic cobalt from combustion processes is assumed to be primarily oxides (Schroeder et al., 1987). Arsenide and sulfide forms are also released into the atmosphere during ore extraction processes. It is unclear whether these forms of cobalt are transformed in the atmosphere. If oxides are transformed into more soluble species such as sulfates, then these may be washed out of the atmosphere in rain. Ultimately, the final repository for cobalt is soil and sediment.

References:

WHO (2006). Concise International Chemical Assessment (CICAD) Document 69, Cobalt and inorganic cobalt compounds.

Milford JB, Davidson CI (1985) The size of particulate trace elements in the atmosphere — a review. Journal of the Air Pollution Control Association, 35(12):1249–1260.

Schroeder WH, Dobson M, Kane DM, Johnson ND (1987) Toxic trace elements associated with airborne particulate matter: A review. Journal of the Air Pollution Control Association, 37(11):1267–1285.