Registration Dossier
Registration Dossier
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EC number: 695-022-6 | CAS number: 473278-76-1
Endpoint summary
Administrative data
Description of key information
Additional information
Tefuryltrione is a water soluble substance (WS: 64.2 g/L at 20°C) that is characterized by a low log Pow (1.9 at 25°C) and a low vapour pressure (VP: 1.8E-10 Pa). Tefuryltrione is not readily biodegradable (4% after 28d, OECD 301F). The substance is hydrolytically stable at environmentally relevant pH values (DT50> 1 yr, OECD 111). Exposed to artificial sunlight, the substance is photolytically degraded in aqueous solution with a half-life of 2.0 – 5.6 days and in soil with a half-life of 3.9 days.
Tefuryltrione is an ionisable substance with a pKa of 3.2 at 20 °C (OECD Guideline 112). Based on the pKa the substance is expected to exist mainly in the ionized from at environmentally relevant pH of 5-9.The log D values determined for the substance decrease with increasing pH. The log D determined at pH 4 is ca. 1.0, whereas a log D of ca.-1.9 was determined at pH 7 and the log D at pH 9 is: ca. -3.9. Based on the log D values bioaccumulation of the substance is not expected.
The Freundlich adsorption constants related to the organic carbon content (Koc) ranged from 33.7 to 246.7 (log Koc = 1.53– 2.39) in four different soils (sandy loam, silt loam, loam, loamy sand, silt loam).
The mineralisation rate, determined in a sediment simulation test, was 0.7 – 1% after 101 days (based on the measured CO2 elevation). In the available studies on the aerobic transformation in soil the substance attained 11.5 to 63.2% degradation (elevation of 14CO2) after 120 days. The substance was not significantly degraded in soil under anaerobic conditions in the dark in the laboratory. The calculated half-lives under anaerobic conditions were > 1000 days.
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