Registration Dossier
Registration Dossier
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EC number: 232-216-8 | CAS number: 7790-62-7
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The alga Pseudokirchneriella subcapitata was exposed to nominal concentrations (0.002, 0.005, 0.01, 0.04, 0.05, 0.07, 0.1 and 0.2 M). After 96 hours the EC10 and EC50 values were determined by cell count.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 1 492 mg/L
- EC10 or NOEC for freshwater algae:
- 656 mg/L
Additional information
No short-term toxicity to aquatic algae and cyanobacteria data were available for the test substance. Therefore, an acute aquatic algae toxicity study with potassium sulphate was used as a read across to fulfill the data gap for the test substance. The underlying hypothesis for the read-across is that the test substance hydrolyses to form sulphuric acid and potassium sulphate. At environmentally relevant pHs, sulphuric acid will ionise to form its respective sulphate ion. In water, potassium sulphate will dissociate to form potassium and sulphate ions. The potassium sulphate study was selected since the relevant species of concern is the potassium cation. Additional documentation, provided within the IUCLID Assessment Reports section, supports the read-across approach.
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