Photodegradation of XXXX enhanced by dissolved organic matter under simulated sunlight.

@entity2769 @entity1815 @entity505 @entity5723 @entity4420
In the present work the degradation of @entity1815 (E1) a natural estrogenic hormone has been studied under simulated solar irradiation. The photodegradation of E1 has been investigated in the absence and in the presence of 7.7-8.9 mg L(-1) of dissolved organic @entity505 ( @entity4420 ), under solar light simulation with irradiance approximating that of the sun. @entity4420 extracts from different origins have been used. Half-lives ranging between 3.9 h and 7.9 h were observed. Results indicated that E1 was photodegraded even in the absence of @entity4420 . The presence of @entity4420 was found to enhance the degradation of E1. Experiments performed with the addition of reactive species scavengers ( @entity2769 ions and @entity5723 ) have shown that these two species play a significant role in the photodegradation. Some experiments have been performed with a @entity4420 previously submitted to solar irradiation. Changes in optical and physico-chemical properties of @entity4420 strongly affect its photoinductive properties, and hence its efficiency on E1 degradation. A part of the study consisted in the investigation of photoproducts structures. Five photoproducts were shown by chromatographic analysis: one arising from direct photolysis and the four others from @entity4420 photoinduced degradation.
