Registration Dossier
Registration Dossier
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EC number: 242-538-0 | CAS number: 18727-04-3
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
LC50 (48h) = 240 mg cobalt hydrogencitrate/L (Chironomus tentans) (read-across from cobalt chloride hexahydrate)
Key value for chemical safety assessment
Additional information
No data on sediment toxicity are available for cobalt hydrogen citrate. However, there are reliable data available for different analogue substances.
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 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 in the derivation of ecotoxicological and environmental fate endpoints, based on the cobalt ion.
In the key study, Chironomus tentans was tested according to APHA guidelines (Standard methods for the examination of water and waste water, 1981) in a static 48-hour test, with cobalt chloride hexahydrate as test substance (Khangarot and Ray, 1989). As a result, a LC50 value of 57 mg Co/L was obtained, equivalent to 240 mg cobalt hydrogen citrate/L. For further species (Branchiura sowerbyi, Tubifex tubifex and Lumbriculus variegatus) 96-hour LC50 values ranged from >45 to 239 mg Co/L, resulting in recalculated values of 190 to 1009 mg cobalt hydrogen citrate/L. The results represent worst-case conditions since the solution will naturally contain more cobalt than would be available in a sediment matrix. The most sensitive value, however not conducted on a standard species, was derived from tests with the mayfly Ephemerella subvaria, resulting in a 96-hour LC50 of 18 mg/L (WHO CICAD, 2006).
References: World Health Organization (2006). Concise International Chemical Assessment Document 69. COBALT AND INORGANIC COBALT COMPOUNDS.
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