Registration Dossier
Registration Dossier
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EC number: 279-242-6 | CAS number: 79720-19-7
Endpoint summary
Administrative data
Description of key information
No simulation test data on biodegradability are available.
Based on valid screening tests on ready biodegradability (OECD 301 B) as well as inherent biodegradability (OECD 302 C) no relevant ultimate biodegradation of the test item is to be expected in the environment.
Additional information
A Modified Sturm test (OECD Guideline 301 B) was performed compliant with GLP (RL 1; Infracor, 2002). As a result, the substance showed no degradation (- 11 % degradation) within 28 days. While inoculum toxicity cannot be excluded as a reason for this (no toxicity control included), an additionally performed determination of the number of colony forming units at the end of the test did not give significant indications for toxicity (CFU/ml: 59x10^5; reference item: 27x10^3; blank 34x10^2).
Therefore, a test on inherent ultimate biodegradability of the test item was performed with non-adapted activated sludge for a period of 28 days. The study was conducted according to OECD Guideline 302 C compliant with GLP (RL 1; Noack, 2015). The test item showed no relevant degradation within 28 days (arithmetic mean value: 3%; n=3).
Based on the results of the sewage treatment plant microorganism toxicity test (OECD 209), the concentration applied in OECD 301B would correspond 10% inhibition of respiration (EC10 21.3 mg/L), the respective concentration from OECD 302C equivalent to 20% inhibition (EC20 30.5 mg/L). Thus, inhibition of certain more sensitive microorganisms possibly decisive for biodegradation cannot be excluded.
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