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Diss Factsheets
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EC number: 201-236-9 | CAS number: 79-94-7
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Phototransformation in water
Administrative data
Link to relevant study record(s)
Description of key information
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).
Key value for chemical safety assessment
- Half-life in water:
- 24 min
Additional information
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 absorbance spectra of the compound and the emission spectra of the light-source were determined and used to calculate disappearance quantum yields of the photochemical reactions that were taking place.
The rates of decomposition were determined at a concentration of 77 µM in water with an illumination time of 50 minutes. Fluorescent tubes provided the irradiation, and were intended to represent the range of solar UV wavelengths that penetrate the atmosphere.
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.
TBBPA decomposed via cleavage between the isopropyl group and one of the benzene rings. Identification of the degradation products of TBBPA by GC–MS analysis and by comparison to synthesised reference compounds indicated that three isopropylphenol derivatives (4-isopropyl-2,6-dibromophenol, 4-isopropylene-2,6-dibromophenol and 4-(2-hydroxyisopropyl)-2,6-dibromophenol) were major degradation products of TBBPA.
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