Registration Dossier
Registration Dossier
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EC number: 242-538-0 | CAS number: 18727-04-3
Toxicity to terrestrial arthropods
Administrative data
Link to relevant study record(s)
Description of key information
NOEC (28d, mortality) = 420 mg cobalt hydrogencitrate/kg soil dw (Folsomia candida) (read-across from cobalt chloride hexahydrate)
Key value for chemical safety assessment
Additional information
No data on toxicity to terrestrial arthropods 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.
Cobalt
Data on soil-dwelling invertebrates resulting in high quality EC50/NOEC values (expressed as Co) are summarized in the WHO CICAD (2006).The only study on an arthopod species, the springtail Folsomia candida, was conducted with cobalt chloride hexahydrate according to ISO-Guideline 11267 on two different soils (artifical soil according to OECD 207 and standardised field soil LUFA 2.2) by Lock et al. (2004). The more sensitive 28-day NOEC of 100 mg Co/kg soil dw (423 mg/kg soil dw, recalculated value for cobalt hydrogen citrate) was measured on standardised field soil (pH CaCl2 5.49) while on artificial soil with a pH(CaCl2) of 7.14, the 28-day NOEC was found to be 1000 mg Co/kg soil dw (4226 mg/kg soil dw, recalculated value for cobalt hydrogen citrate). Cation exchange capacity and pH are indicated as main factors influencing cobalt bioavailability.
References: World Health Organization (2006). Concise International Chemical Assessment Document 69. COBALT AND INORGANIC COBALT COMPOUNDS.
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