Registration Dossier
Registration Dossier
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 202-696-3 | CAS number: 98-73-7
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Disregarded data as suggested by EU risk assessment report, p.27 (due to large pH variation/lack of detailed pH documenation): EC50/96 h of 2 mg/l (calculated by probit analysis) for Selenastrum capricornutum (Prinz).
Key data: study according to TG OECD 201 and the Directive (EEC) 92/69, C 3, using Pseudokirchneriella subcapitata: EC50/72 h > 94 mg/l (estimated); NOEC/72 h = 21 mg/l; the lowest concentration where effects were observed for both growth rate and biomass was 43 mg/l (= LOEC, 72 h).
Comment in the EU risk assessment to TG OECD 201 study:
The test is well documented and valid. It should be noted that in the pH range of the test PTBBA has been completely (> 99.9 %) in its dissociated form and lower effect values could be expected at lower pH.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 94 mg/L
- EC10 or NOEC for freshwater algae:
- 21 mg/L
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
