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2012, Volume 6, Issue 4

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Frontiers of Environmental Science & Engineering >> 2012, Volume 6, Issue 4 doi: 10.1007/s11783-012-0419-6

Identification and ecotoxicity assessment of intermediates generated during the degradation of clofibric acid by advanced oxidation processes

1. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process; Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, China; 2. Datang Energy Corporation, Hulunbeier 021008, China

Available online: 2012-08-01
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Abstract

The aim of this study was to identify the intermediates in clofibric acid degradation under various advanced oxidation processes, namely ultraviolet (UV), UV/H O , vacuum ultraviolet (VUV), VUV/H O , and solar/TiO processes, as well as to assess the toxicity of these intermediates. Eleven intermediates have been detected by gas chromatography-mass spectrometer, most of which were reported for the first time to our best knowledge. Combining the evolution of the dissolved organic carbon, Cl and specific ultraviolet absorption at 254 nm, it could be deduced that cleavage of aromatic ring followed by dechlorination was the mechanism in solar/TiO process, while dechlorination happened first and accumulation of aromatic intermediates occurred in the other processes. Different transformation pathways were proposed for UV-, VUV-assisted and solar/TiO processes, respectively. The acute toxicity was evaluated by means of T spp. bioassay. It was believed that aromatic intermediates increased the toxicity and the ring-opening pathway in solar/TiO process could relieve the toxicity.

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