Registration Dossier
Registration Dossier
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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
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