Registration Dossier
Registration Dossier
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EC number: 242-538-0 | CAS number: 18727-04-3
Bioaccumulation: terrestrial
Administrative data
Link to relevant study record(s)
Description of key information
BCF/BAF (Co): 0.007 to 0.81 (wet weight basis) in plants
Key value for chemical safety assessment
Additional information
No data for terrestrial bioaccumulation are available for cobalt hydrogen citrate. However, there are reliable data available for different analogue substances and for cobalt measured as element in field investigations, respectively.
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.
In terrestrial environments, four acceptable biota-to-soil accumulation factors (BSAF-soil) values were identified for two species, Xerocomus badius (bay bolete), and Morus alba (white mulberry). Measurements for X. badius ranged from 0.007 to 0.81, with an average value of 0.15 in the cap, and 0.11 in the stalk (unitless, based on wet-weight). For M. alba, maximum BSAF-soil values of 0.28 and 0.08 were found. One soil study considered the cobalt concentration in a soil solution, thus providing bioaccumulation factors for three different plant species. These values ranged from 0.100 to 0.146, wet-weight. All values obtained from soil studies were reported using dry-weight measurements and then converted to wet-weight values. It is observed that the average BSAF-soil and BAF values of these acceptable studies are all less than one (Environment Canada, 2011).
References:
Environment Canada. Health Canada (2011). Screening Assessment for the Challenge. Cobalt, cobalt chloride, cobalt sulfate.
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