Registration Dossier
Registration Dossier
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EC number: 200-929-3 | CAS number: 76-05-1
Distribution modelling
Administrative data
- Endpoint:
- distribution modelling
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- not specified
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- documentation insufficient for assessment
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 997
- Report date:
- 1995
Materials and methods
- Model:
- other: a simple basin model and a plume model
- Calculation programme:
- no data
- Media:
- water - air
Test material
- Reference substance name:
- TFA
- IUPAC Name:
- TFA
- Details on test material:
- - Name of test material (as cited in study report): TFA
Constituent 1
Results and discussion
Percent distribution in media
- Water (%):
- 30
Any other information on results incl. tables
The enhancements in TFA in rainwater due to pollution events should probably be no more than 30% above the background level.
Applicant's summary and conclusion
- Conclusions:
- The removal of TFA in fog was considered. TFA concentrations in fog water can be quite large. However, the fog water concentration should not affect the TFA concentrations in the ground water as it will be diluted by rainfall once it enters the ground water system.
- Executive summary:
Before calculated an annually average TFA concentration in rainwater, it's necessary to calculate the concentration of TFA in rainwater for each individual rainfall event. A simple basin model was developed and a plume model to be used in conjunction with the basin model. The conditions in which rainfall occurs directly after a pollution episode in the basin were explored. Also, explored the case where no rainfall occurs in the basin were explored, but rather a plume leaves the basin and rainfall occurs at some time later downwind from the basin. In the cases considered, the additional contribution to TFA in rainwater for a single rain event is limited to a few µg/liter unless the OH concentration a factor of 10 larger than the global averaged values of 1x10^6 molecules/cm.
The removal of TFA in fog was considered. TFA concentrations in fog water can be quite large. However, the fog water concentration should not affect the TFA concentrations in the ground water as it will be diluted by rainfall once it enters the ground water system.
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