Registration Dossier
Registration Dossier
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EC number: 406-260-5 | CAS number: 58834-75-6 BTN; VPO CATALYST
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Algal growth inhibition: ErC50 = >35.4 mg/L; EbC50 = 25.5 mg/L; NOEC = 17.7 mg/L
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 35.4 mg/L
- EC10 or NOEC for freshwater algae:
- 17.7 mg/L
Additional information
Algal growth inhibition has been investigated in a 72 hour test according to OECD/EU test methods
The soluble fraction of the substance was tested and the EC50 (72h) determined to be 25.5 mg/L expressed as biomass and >35.4 mgL expressed as growth rate. These are equivalent to EC50s of 380 mg/L and >528 mg/L, respectively, of BTN/A.NOEC for both biomass and growth rate was 17.7 mg/L expressed as soluble material and 264 mg/L BTN/A.
In accordance with ECHA guidance on information requirements and chemical safety assessment,Chapter R.7b: Endpoint specific guidance, theErC50 endpoint is used in DNEL derivation. This is because use of values based on biomass cannot be applied to an analysis of results from a system in exponential growth without logarithmic transformation.
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