Registration Dossier
Registration Dossier
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EC number: 257-182-1 | CAS number: 51410-72-1
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The 72 h EC50 of MAPTAC in freshwater algae was >100 mg a.i./L.
The 72 h EC10 of MAPTAC in freshwater algae was >100 mg a.i./L.
(OECD guideline 201)
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 100 mg/L
- EC10 or NOEC for freshwater algae:
- 100 mg/L
Additional information
One study in freshwater algae is available for MAPTAC, which is considered reliable without restriction (Klimisch score 1).
In a 72 hour acute toxicity study, the cultures of Desmodesmus subspicatus CHODAT SAG 86.81 were exposed to MAPTAC (50% in aqueous solution; exposure concentration corrected for purity) at nominal and measured concentrations of 0 (control) and 100 mg a.i./L under static conditions in a limit test in accordance with the OECD guideline 201 (adopted 23 March 2006).
No growth and yield inhibition were observed. The NOEC based on growth rate and yield ware both 100 mg a.i./L. The EC10 based on growth rate and yield were both > 100 mg a.i./L. The EC50 based on growth rate and yield were both > 100 mg a.i./L.
Microscopic evaluation of the cells at start and end of the incubation period revealed no morphological abnormalities.
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