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
The test substance was shown to be hydrolytically stable at pH 4, 7, and 9 (DT50: > 1 year at 25 °C).
Tefuryltrione is photolytically degraded in aqueous solution with a half-life of 2.0 – 5.6 days.
Moreover, tefuryltrione is photolytically degraded in soil with a half-life of 3.9 days.
Additional information
In a GLP and OECD Guideline 111 study, hydrolytic degradation of the test substance was assessed at pH 4, pH 7 and pH 9. In a preliminary hydrolysis test performed at 50 °C in aqueous solution at pH 4, 7 and 9 the mean residual rate of the test substance was at least 90% at all pH levels. Therefore, the test substance was shown to be hydrolytically stable (DT50 (25 °C) > 1 year).
The photolysis of tefuryltrione was studied in a sterile aqueous buffer solution at pH 7 and in sterile natural paddy water under exposure to simulated sunlight. The half-lives (DT50) for tefuryltrione in sterile aqueous pH 7 buffer solution were between 10.7 and 15.2 days. The half-lives (DT50) for tefuryltrione in sterile natural paddy water were between 2.0 and 5.6 days.
The photolytic route and rate of degradation of tefuryltrione was studied in soil under exposure to simulated sunlight and aerobic conditions in the laboratory for 9 days at 20 °C and 55 ± 5% of the maximum water holding capacity. The degradation half-live (DT50) for tefuryltrione in soil was 3.9 days.
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