Registration Dossier
Registration Dossier
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EC number: 242-604-9 | CAS number: 18824-74-3
Phototransformation in water
Administrative data
Link to relevant study record(s)
- Endpoint:
- phototransformation in water
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with generally accepted scientific standards and described in sufficient detail
- Justification for type of information:
- In the absence of biodegradation and hydroyltic degradation routes, research has focussed on effect of sunlight on stability.
Even though the potassium salt is water soluble, key research has been on the acid form as this is appropriate for understaninf long-term environmental fate.
Although not following standard methods (and in the absence of some methodology), this research paper has been cited by the US EPA in their assessment of the environmnetal fate of tetrabrominated phthalates. - Study type:
- direct photolysis
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Half-life was determined in a number of solvents as it was not possible to disolve the acid in water
- GLP compliance:
- not specified
- Specific details on test material used for the study:
- The starting substance for the research included alkyl esters. These were show to partly biodegrade/hydrolyse to the acid form and therefore the ultimate fate of the tetrabromophthalic acid is key.
- Radiolabelling:
- no
- Analytical method:
- not specified
- Details on sampling:
- Samples were taken over a period of time to determine a half life
- Light source:
- sunlight
- Details on light source:
- Described as natural sunlight
- Reference substance:
- not specified
- Dark controls:
- not specified
- Preliminary study:
- Testing performed represented preliminary study only
- Remarks on result:
- not determinable because of methodological limitations
- DT50:
- > 86 - < 220 min
- Transformation products:
- yes
- No.:
- #1
- Details on results:
- Pathways showed de-bromination when exposed to sunlight.
Note that in the primary research, tetrabromophthalic acid was itself one of the transformation products. - Validity criteria fulfilled:
- not specified
- Conclusions:
- The substance will lose the bromine when exposed to sunlight, resulting in the formation of phthalic acid.
Reference
Description of key information
Half-life reported 86 - 220 minutes
Key value for chemical safety assessment
- Half-life in water:
- 220 min
Additional information
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