Registration Dossier
Registration Dossier
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EC number: 204-278-6 | CAS number: 118-79-6
Endpoint summary
Administrative data
Description of key information
Additional information
2,4,6-tribromophenol was shown to be hydrolytically stable and to photodegrade in air with a half life of 4.6 hours and the half-life for photolysis in water was 11.5 hours.
Studies show that enriched cultures of bacteria from wastewater and in water/sediment systems are capable of biodegrading 2,4,6-tribromophenol through reductive debromination, with transformation to 4-bromophenol. Degradation rates depend in part on temperature and whether these were other food sources present for the bacteria. Rapid (36 hours) degradation of 2,4,6-tribromophenol was observed enriched cultures of bacteria isolated from a marine sediment. It can be reasonably concluded that the test material is inherently biodegradable in both freshwater and marine conditions.
2,4,6-tribromophenol is also rapidly biodegraded in soil under aerobic conditions, with a geometric mean half life of 7 days at 20°C (DT50 5 - 10 days, 3 soils), indicating non-persistence. Mineralisation to carbon dioxide and the formation of bound residues were demonstrated. No single degradation product was greater than 10%.
The values used for the CSA are as follows:
Hydrolysis: hydrolytically stable
Photodegradation half-life: 4.6 h
Photolysis half-life:11 hr
DT50 in soil: 7 d at 20°C
Biodegradability: Inherently biodegradable
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