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EC number: 412-570-1
CAS number: 119462-56-5
The aquatic toxicity was tested on all
tropic levels and showed that fish are the most sensitive species with
an 96h LC50 of 0.174 mg/L. Two chronic values are present; one from the
algal assay of 11 mg/L and one from a Daphnia magna reproduction study,
which gave the lowest EC10 on reproduction of 0.205 mg/L.
1,3-bis(3-methyl-2,5-dioxo-1H-pyrrolinylmethyl)benzene is biotically
degradable however the criterion of >70% COD or 60% CO2 evolution was
not reached within 28 days. The substance is abiotically degradable with
a half-life of 68.5 hours at 25°C. The CLP regulation states
(chapter 126.96.36.199.4) that hydrolysis can be considered if the hydrolysis
products do not fulfill the criteria for being hazardous to the aquatic
envirionment. However the hydrolyis products are unknown and therefore
cannot be evaluated. The following classifications are applicable
1. H400: Based on the lowest acute value of
0.174 mg/L the substance is aquatic acute cat. 1
2. H411: Based on the lowest chronic value
of 0.205 mg/L for degradable substances with unknown hydrolysis
products, 1,3-bis(3-methyl-2,5-dioxo-1H-pyrrolinylmethyl)benzene is
aquatic chronic cat. 2.
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