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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

EC50 (72 h, growth rate) = 26 mg/L (Pseudokirchneriella subcapitata);
NOEC (72 h, growth rate) = 4.1 mg/L (Pseudokirchneriella subcapitata)

Key value for chemical safety assessment

EC50 for freshwater algae:
26 mg/L
EC10 or NOEC for freshwater algae:
4.1 mg/L

Additional information

The influence of the test item 3-Mercaptopropionic acid on the growth of the freshwater green algal species Pseudokirchneriella subcapitata (formerly Selenastrum capricornutum) was investigated in a 72 hour laboratory study according to the OECD Guideline 201 by Hoeger (2008). The resulting inhibitions of the growth rates are based on the initial measured concentrations (mg/L) of the test item and were EC10 = 17, EC50 = 26, NOEC = 4.1, and LOEC = 8.0 mg/L, respectively.