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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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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