Registration Dossier
Registration Dossier
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EC number: 212-751-3 | CAS number: 866-81-9
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
LC50(48h)=178 mg Tricobalt dicitrate/L
Key value for chemical safety assessment
- EC50 or LC50 for freshwater sediment:
- 178 mg/kg sediment dw
Additional information
Data on single-species toxicity tests resulting in high quality L(E)C50 values (expressed as Co) for sediment-dwelling species (n=5) are summarised in Table 2 of the WHO CICAD document, 2006 (see attached document).
Data on five species were available for the assessment. The key study 48-hour LC50 value for Chironomus tentans was at 57 mg Co/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 140 to 744 mg Tricobalt dicitrate/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 no standard species, was derived from tests with the mayfly Ephemerella subvaria, resulting in a 96-hour LC50 of 18 mg/L.
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