Registration Dossier
Registration Dossier
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EC number: 617-441-5 | CAS number: 83121-18-0
Endpoint summary
Administrative data
Description of key information
Hydrolysis:
In the key study (BASF DocID: TZ-322-001, 1987) teflubenzuron was found to be stable to hydrolysis at pH 5 and 7 after 30 d at 25°C. At a temperature of 25 °C and a pH of 9 the hydrolsis DT50 of teflubenzuron is 8.7 days . The hydrolysis DT50 of teflubenzuron at pH 9 was calculated to be 24.6 days at 12 °C (Chapter R.7b, p.222: Endpoint specific guidance Version 4.0 – June 2017). The metabolites identified after 30 days at pH 9 were 3,5-dichloro-2,4-difluorophenylurea (61% AR from the aniline label), 3,5-dichloro-2,4-difluoroaniline (12% AR from the aniline label), 2,6-difluorobenzoic acid (62% AR from the benzoyl label), 2,6-difluorobenzamide (12% AR from the benzoyl label), and N-(2,4-difluoro-3,5-dichlorobenzene)-5-fluoro[3H]-dihydroquinazoline-2,4-dione (8% AR from the aniline label and 5% AR from the benzoyl label).
Phototransformation in air:
Following the Atkinson calculation, the photochemical half-life for reactions with OH-radicals (12-hr day; 1.5 x 106 OH/cm3) was determined to be 1.7 days (BASF DocID: TZ-630-013).
Phototransformation in water:
Teflubenzuron was stable to photolysis for up to 7 days (93% AR as teflubenzuron, BASF DocID: TZ-322-002, 1987) at pH 5 and 25 °C. The degradation was then accelerated with 45% AR as teflubenzuron after 15 days. A photolytic half-life was estimated at about 10 days.
Since teflubenzuron was stable for up to 7 days, it was proposed that no aqueous photolysis studies are required on metabolites.
Phototransformation in soil:
In the study of Hawkins (1987, DocID: TZ-620-007) Teflubenzuron was photodegraded with a half-life of about 104 days. The metabolite 3,5-dichloro-2,4-difluorophenylurea appeared after 15 days at a level of 2% AR.
Photodegradation will not be the main degradation route of teflubenzuron in soil.
Additional information
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