Study of the photochemical transformation of 2-ethylhexyl 4-(dimethylamino)benzoate (OD-PABA) under conditions relevant to surface waters
Articolo
Data di Pubblicazione:
2016
Abstract:
We studied the aquatic environmental fate of 2-ethylhexyl 4-(dimethylamino)benzoate (OD-PABA), a widespread sunscreen, to assess its environmental persistence and photoinduced transformation. Direct photolysis is shown to play a key role in phototransformation, and this fast process is expected to be the main attenuation route of OD-PABA in sunlit surface waters.
The generation of transformation products (TPs) was followed via HPLC/HRMS. Five (or four) TPs were detected in the samples exposed to UVB (or UVA) radiation, respectively. The main detected TPs of OD- PABA, at least as far as HPLC-HRMS peak areas are concerned, would involve a dealkylation or hydrox- ylation/oxidation process in both direct photolysis and indirect phototransformation. The latter was simulated by using TiO2-based heterogeneous photocatalysis, involving the formation of nine additional TPs. Most of them resulted from the further degradation of the primary TPs that can also be formed by direct photolysis. Therefore, these secondary TPs might also occur as later transformation intermediates in natural aquatic systems.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
OD-PABA; Photolysis; Sunscreen; Titanium dioxide; Transformation products; Water Science and Technology; Waste Management and Disposal; Pollution; Ecological Modeling
Elenco autori:
Calza, P; Vione, D.; Galli, F.; Fabbri, D.; Dal Bello, F.; Medana, C.
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