Registration Dossier
Registration Dossier
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EC number: 701-135-4 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Stability
Due to the complex nature of the test material, it was considered that determination of the hydrolytic stability according to Method C7 Hydrolysis as a Function of pH of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 111 of the OECD Guidelines for Testing of Chemicals, 13 April 2004 was not feasible. The hydrolytic stability of the main constituents was estimated using the specialist estimation software, HYDROWIN v2.00 (September 2010), © 2000 U.S. Environmental Protection Agency. Overall, it was considered that the test item would be essentially stable towards hydrolysis (half-life greater than 1 year at 25°C) at pH 4, 7 and 9.
Biodegradation
Given the results of the three OECD TG screening tests for biodegradation in water were inconclusive, an OECD 309 biodegradation in surface water, simulation study, was conducted. The resulting DT50 values were 12.6 days (at 10 µg/L) and 16.2 days (at 100 µg/L). The substance degraded to up to eight major unidentifiable degredates (10.4–37.0% AR). In addition, eleven minor unidentified degredates were present at low levels (≤7.3% AR).
The substance can be considered biodegradable.
Bioaccumulation
Low potential for bioaccumulation in aquatic species was observed in an OECD 305 study. For the test substance itself, the growth corrected-lipid normalized biomagnification factor (BMFKgl) was calculated to be 0.023 with a half-life of approximately 5.5 days. For the main metabolite (M8), the growth corrected-lipid normalized biomagnification factor (BMFKgl) was calculated to be 0.027 with a half-life of approximately 1.05 days. The estimated BCFs are below the bioaccumulation triggers for a bioaccumulative (“B”: 2000 L/kg) or very bioaccumulative (“vB”: 5000 L/kg) substance.
Distribution
The organic-carbon partition (Koc) of the test item was determined to be in the range less than 17.8 to 1.63 x 10^3, log10 Koc in the range less than 1.25 to 3.21. These values indicate that the test item would have a range of mobility from very high to low according to McCall et al.
Additional information
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