Registration Dossier
Registration Dossier
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EC number: 220-292-5 | CAS number: 2705-87-5
Endpoint summary
Administrative data
Description of key information
Additional information
Valid acute toxicity tests with the test substance are available for three freshwater species from three trophic levels). In the guideline study over 96 hours under flow-through conditions 100% mortality was observed at 0.26 mg/L and a value of LC50 was determined to be 0.13 mg/L (based on mean measured concentrations).
In a flow-through daphnia study over 48h an EC50 of 3.8 mg/L (nominal) was observed.
In the valid static algae study the ErC50 after 72 hours was 3 mg/L (measured initial) based on concentration measured on day 0. The ErC10 was determined to be 1.6 mg/L (measured initial).
Since fish is the acutely most sensitive species, a long-term toxicity of the test item to fish (early life-stage toxicity to fish) was conducted and resulted in an EC10 value of 0.064 µg/L based on the most sensitive endpoints, survival and growth.
According to the results above, the lowest L(E)C10 value of the three studies (Fish EC10 = 0.064 µg/L) is used in the hazard assessment and for derivation of aquatic PNECs.
No test on micro-organisms toxicity is available, but as the substance is readily biodegradable the tested concentration of 2 mg/L is assumed to be non toxic to microorganisms. Therefore no further test on microbial toxicity was conducted and 2 mg/L was used as NOEC for the microorganism toxicity.
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