Registration Dossier

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:
1997
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
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): TFA

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.