Registration Dossier
Registration Dossier
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EC number: 236-631-5 | CAS number: 13453-69-5
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The effects of dilithium tetraborate on Pseudokirchneriella subcapitata were determined by an experimental study conducted according to OECD guideline No. 201.
Growth rate and yield were in the range of the controls at the lowest test concentration during the 72‑hour test period, whereas at higher concentrations growth rate and yield were increasingly inhibited. Statistically significant inhibition of growth rate and yield was found at test concentrations of 18 mg/L and higher.
In the environment, all lithium borate substances in the category rapidly dissociate and release the same common compound, boric acid as a result of relevant transformation pathways. Therefore, lithium metaborate will inhibit the growth and yield of Pseudokirchneriella subcapitata in a similar manner. In conclusion, lithium metaborate is expected to reduce the growth rate and inhibit the yield of this fresh water algae species significantly at a nominal test concentration of 18 mg/L or greater.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 100 mg/L
- EC10 or NOEC for freshwater algae:
- 32 mg/L
Additional information
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