Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

HSDB database:

If released to air, water or soil, the environmental fate of dicobalt octacarbonyl is primarily influenced by its reactivity with oxygen. Dicobalt octacarbonyl decomposes instantaneously (seconds) to generate carbon monoxide and cobalt oxides on contact with air or water. In oxygenated waters or soil, the dicobalt octacarbonyl will be converted to dissolved Co2+ species that will speciate to various forms, including insoluble forms depending on factors such as pH, redox potential, and presence of dissolved and dispersed organic matter. Due to its reactivity, unreacted dicobalt octacarbonyl is not expected to persist in any environmental compartment. [SRC, peer-reviewed; OECD, Guidance on Selecting a Strategy for Assessing the Ecological Risk of Organometallic and Organic Metal Salt Substances Based on Their Environmental Fate. Series on Testing & Assessment No. 212. ENV/JM/MONO(2015)2, Feb 9, 2015. Available from, as of Jan 30, 2017, peer-reviewed]