Registration Dossier
Registration Dossier
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EC number: 216-885-3 | CAS number: 1689-99-2
Phototransformation in water
Administrative data
Link to relevant study record(s)
Description of key information
2,6-dibromo-4-cyanophenyl octanoate is photolytically degraded in aqueous solution with a half-life ranging from 5.2 hours to 16.7 days.
Key value for chemical safety assessment
- Half-life in water:
- 16.7 d
Additional information
The endpoint “phototransformation in water” is not a data requirement for the registered substance. However, for the sake of completeness this endpoint is covered by a short summary of the available data. There are a total of five studies on the phototransformation in water available.
In the first study, the photolysis of 2,6-dibromo-4-cyanophenyl octanoate was investigated in sterile aqueous buffer solution at pH5 according to the OECD Guideline No. 316 (2008) and GLP. Under the experimental conditions used the test substance degraded with an experimental half-life of 3.3 days.
The environmental half-life of 2,6-dibromo-4-cyanophenyl octanoate in the top millimeters of natural aquatic systems was estimated according to the method described in ECETOC Technical report No. 12 (1984) and the German UBA Test Guideline (1990). The photolytic half-life of the test substance was shown to range from 34 hours in June to 404 hours in December (related to the climatic situation in Central Europe and the adjacent North Sea).
The third study was performed according to the ECETOC Technical report No. 12 (1984) and estimated the photolytic half-life of 2,6-dibromo-4-cyanophenyl octanoate to > 4 days for each month.
Another study determined the DT50 of the test substance in aqueous solution to be 18.3 hours, following GLP and BBA part IV, 6-1 (1990).
In a fifth study, studied the photolytic degradation of 2,6-dibromo-4-cyanophenyl octanoate in aqueous buffer (pH 7.5) solution by exposing the compound to long wavelength ultra-violet light (λ>290 nm). The DT50 of the test substance in aqueous solution was determined to be 18.3 hours.
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