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EC number: 200-929-3
CAS number: 76-05-1
The enhancements in TFA in rainwater due to pollution events should
probably be no more than 30% above the background level.
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
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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