Registration Dossier
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EC number: 231-104-6 | CAS number: 7439-95-4
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The 72 h EC50/EC10 of Magnesium Sulfate to Pseudokirchnerella subcapitata is >99.2 mg/L and for Magnesium >20 mg/L.
- Concentrations of the test substance in the test solution: At 0 hour (the start of the test), the mean measured concentration was 99.0 mg/L (99.0% of the nominal concentrations). The mean concentration measured at 72 hours (the end of the test) was 99.4 mg/L (99.4% of the nominal concentrations).
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 20 mg/L
- EC50 for marine water algae:
- 2 mg/L
- EC10 or NOEC for freshwater algae:
- 20 mg/L
- EC10 or NOEC for marine water algae:
- 2 mg/L
Additional information
The available data for saltwater aquatic algae and cyanobacteria are limited and to obtaine the value for PNECs for saltwaters is taken account a assesment factor 10 to extrapolate to LC50 following the “Guidance on Information Requirement and Chemical Safety Assessment R.10: Characterisation of dose [concentration]- response for environment”and “Table R.10-5 Assessment factors proposed for deriving PNEC water for saltwater for different data sets”, to account for the possibility that greater taxonomic diversity in the marine environment makes it likely that some marine taxa may be more sensitive than the most sensitive freshwater taxa.
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