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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 72-hour algae NOEC was 150 mg/L (measured as maleic acid in neutralized conditions and the highest dose tested).

Key value for chemical safety assessment

EC50 for freshwater algae:
150 mg/L
EC10 or NOEC for freshwater algae:
150 mg/L

Additional information

Toxicity tests to the freshwater alga Pseudokirchneriella subcapitata (formerly known as Selenastrum carpricornutum) found no effects on either growth or biomass after 72 hours at 150 mg/liter maleic anhydride. Arithmetic average concentration in the highest concentration nominally 150 mg/liter as maleic acid. Because no effects were observed in all concentrations, the EC50 can be estimated as > 150 mg/liter.