Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 242-538-0 | CAS number: 18727-04-3
Endpoint summary
Administrative data
Description of key information
Additional information
The environmental fate pathways and ecotoxicity effects assessments for cobalt metal and cobalt compounds is based on the observation that adverse effects to aquatic, soil- and sediment-dwelling organisms are a consequence of exposure to the bioavailable cobalt ion, released by the parent compound. The result of this assumption is that the ecotoxicology will be similar for all soluble cobalt substances used in the ecotoxicity tests. Therefore, data from soluble cobalt substances are used for the derivation of ecotoxicological and environmental fate endpoints, based on the cobalt ion.With respect to these considerations, data collected on elemental cobalt (e.g. environmental concentrations for Co2+) can also be taken into account.
No adsorption/desorption data are available for cobalt hydrogen citrate, however various reliable data exist for cobalt (measured as environmental concentrations) and different analogue cobalt substances showing statistical or conservative partition coefficients for suspended matter, soil, STP, sediments in freshwater and in coastal waters. For cobalt, log Kd values for all types ranged from 0.41 to 5.83.
Information taken from WHO CICAD (2006):
Volatility
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 >2μm 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 2.6μm in one study. Data on the transformations of cobalt in the atmosphere are limited (WHO CICAD, 2006).
Adsorption
Ultimately, the final repository for cobalt is soil and sediment. Released into water, cobalt may sorb to particles and settle into sediment or sorb directly to sediment. Complexation of cobalt to dissolved organic substances can reduce sediment sorption.
Environmental distribution
Interparticle migration of cobalt can affect the transport of metal ions in sediments. In addition, cobalt can be transported in dissolved form or as suspended sediment by rivers and by sea and ocean currents. Concentration profiles of cobalt in deep water suggest that dissolved amounts decrease with increasing depth and that dissolved cobalt is precipitated in the adsorbed state with oxides of iron and manganese and with crystalline sediments such as aluminosilicate and goethite. Humic substances/humic acids are naturally present in aquatic environments and bind strongly to cobalt. Over time, these complexes may transform into stronger complexes where cobalt is less readily disassociated. The distribution coefficient of cobalt in water varies due to pH, redox conditions, ionic strength, and dissolved organic matter concentrations (WHO CICAD, 2006).
References:
World Health Organization (2006). Concise International Chemical Assessment Document 69.COBALT AND INORGANIC COBALT COMPOUNDS.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
