Registration Dossier
Registration Dossier
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EC number: 212-751-3 | CAS number: 866-81-9
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
LC50(96h) = 1.86 mg Tricobalt dicitrate/L for freshwater algae
LC50(96h) = 0.93 mg Tricobalt dicitrate/L for marine algae
NOEC(21d) = 1.86 mg Tricobalt dicitrate/L for freshwater algae
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 1.86 mg/L
- EC50 for marine water algae:
- 0.93 mg/L
- EC10 or NOEC for freshwater algae:
- 1.86 mg/L
Additional information
Data on algae toxicity tests resulting in high quality EC50 values (expressed as Co) for freshwater algae and protozoans (n=10) are summarised in Table 2 of the WHO CICAD document, 2006 (see attached document).
Acute and chronic data for different algae species in fresh- and saltwater were extracted and used in the effects assessment.
The EC50 values for freshwater algae range from 0.6 mg Co/L for Chlorella vulgaris to 10.8 mg Co/L for Spirulina platensis. Two EC50 values were available for marine species with a similar spectrum of 0.3 mg Co/L for Ditylum brightwellii and 10.2 mg Co/L for Nitzschia closterium. The 21-day NOECs and LOECs for freshwater algae ranged from 0.6 to 1.6 mg Co/L.
These findings result in recalculated values from 1.9 to 33.6 mg Tricobalt dicitrate/L for acute freshwater endpoints, from 1.3 to 31.7 mg Tricobalt dicitrate/L for acute marine endpoints and from 1.9 to 5.0 mg Tricobalt dicitrate/L for chronic freshwater endpoints.
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