Registration Dossier
Registration Dossier
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EC number: 201-236-9 | CAS number: 79-94-7
Endpoint summary
Administrative data
Description of key information
Additional information
TBBPA may undergo abiotic degradation. Degradation of TBBPA by light was investigated in both air and water.
Air
To investigate photolysis of the test material, 14-C TBBPA applied to a silica gel surface was irradiated with 254 nm UV light. To determine degradation products of 14-C TBBPA photolysis, larger amounts of the substance were applied to plates and irradiated for 5 days. After this, residues were subjected to analysis.
Initially, TBBPA decreased rapidly with a half-life of about 0.12 day. However, after 0.25 day of UV exposure, the rate of degradation decreased. The half-life of the second phase was determined to be 1.1 day.
Water
A method was developed for studying the phototransformation following UV irradiation of aqueous solutions of tetrabromobisphenol A (TBBPA) and related compounds at various pHs. The rates of decomposition were determined at a concentration of 77 µM in water with an illumination time of 50 minutes.
TBBPA’s rate of decomposition in water under UV irradiation (k x 10³ (s^-1)) ranged from 0.7 (at pH = 10) to 0.033 (at pH = 5.5). Its half-life ranged from 16 (at pH = 10) to 350 (at pH = 5.5) minutes; TBBPA’s half-life at pH 7.4 = 24 minutes. The disappearance quantum yield ranged from 0.045 (pH = 10) to 0.018 (pH = 5.5).
The data indicated that TBBPA was readily photodegraded in aqueous solution. Degradation rates were sensitive to pH; the rate of decomposition of TBBPA was six times higher at pH 8 than at pH 6.
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