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Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

LC50 fish (96h): 85 mg/l (Oncorhynchus mykiss)

NOEC/LC10 fish (35d): 10 mg/l (Danio rerio)

EC50 Daphnia (48h): > 130 mg/l

NOEC Daphnia (21d): 53 mg/l

EC50 algae (72h): 45 mg/l (growth rate) (Pseudokirchnerella subcapitata)

NOEC algae (72h): 8.2 mg/l (growth rate) (Pseudokirchnerella subcapitata)

EC10 microorganisms (17h): 100 mg/l (Pseudomonas putida)

Additional information

Data availability: For MAA acute as well as chronic studies of sufficient reliability are available for all three trophic levels and also reliable microbial toxicity data.

Summary:

The aquatic toxicity of methacrylic acid was investigated on all three trophic levels using acute as well as long-term toxicity tests. The results of acute aquatic toxicity tests indicated that the test substance is of low toxicity to aquatic invertebrates (EC50 Daphnia magna: > 130 mg/L) and harmful to fish (LC50 fish (96h): 85 mg/l (Oncorhynchus mykiss) and algae [ECr50 (72h): 45 mg/L, NOEC (72h): 8.2 mg/l with Pseudokirchneriella subcapitata].

In the long-term toxicity tests, fish toxicity in an early life stage test with Danio rerio was the most sensitive endpoint with a NOEC of 10 mg/L, while a 21d Daphnia reproduction test had a NOEC of 53 mg/L.

The microbial EC10 (17h) was determined to be 100 mg/L based on growth inhibition of Pseudomonas putida.

As methacrylic acid has no potential to bioaccumulate in organisms and is readily biodegradable in OECD 301 screening tests ( fulfilling 10 day window) the substance does not have to be classified of environmental hazard acc. EU CLP criteria.