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Environmental fate & pathways

Phototransformation in water

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Description of key information

Supporting studies: Data from publications. 

Key value for chemical safety assessment

Additional information

Supporting studies:

Based on the experiments reported here, it can be safely concluded:

1. Individual irradiation of Trichloroacetic acid solution with US or UV produced perceptible changes in TOC removal and formation of Cl- ions. However, it is important to note that the decomposition of aqueous Trichloroacetic acid becomes more remarkable in photosonochemical process.

2. In photosonochemical process, the dechlorination rate of test substance under oxygen is higher than that under air.

3. The effect of the solution pH value on the photosonochemical degradation of test substance is complicated. In this case, higher pH is effective to dechlorination and TOC removal.

The half-life of trichloroacetic acid from the photodegradation at 15 °C is 6 day.

With titanium dioxide:

Rate constant/s IC= 1,28x10-6

Rate constant/s titration= 1,15x10-6

Without titanium dioxide:

Rate constant/s IC=6,40x10-8