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Environmental fate & pathways

Phototransformation in air

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Two publications are available to assess the phototransformation of TFA and NaTFA in air. TFA appears to be very unreactive compound with respect to photo-catalytic degradation and to radical-induced destruction, and TFA is degraded very little in the course of the experiments.

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Two publications are available to assess the phototransformation of TFA and NaTFA in air.

In the first publication (Klaus-Dieter, 1993) the possible reductive and oxidative degradation of TFA has been investigated by photocatalytic experiments conducted with aqueous suspensions of semiconducting materials. These studies were corroborated by some electrochemical and radiation chemical experiments. TFA proved to be a rather inert compound under practically all conditions, i.e., it did not react with reducing or oxidizing entities generated by means of these techniques. The only indication for an onset of degradation was observed at high pH > 10.5. In such basic environment a small yield of fluoride was liberated. From accompanying gamma-radiolysis experiments it appears that this is a result of a reductive mechanism which leads also to CO2 as further product. The overall degradation yield in alkaline systems is, however, still very low.

In the second publication (Maruthamuthu, 1995) the photolysis of TFA resulted in the formation of 92 µmol/L of CO2 after 42 min corresponding to 0.92% degradation, but further photolysis did not generate additional amount of carbon dioxide. The rate of loss of TFA is lower than 1. The rate of the reaction of OH with TFA is too slow to measure.