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Title: Fast atrazine photodegradation in water by pulsed light technology
Authors: Beatriz Baranda, Ana; Barranco, Alejandro; Martinez de Maranon, Inigo
Citation: WATER RESEARCH, 2012, 46, 669-678
Abstract: Pulsed light technology consists of a successive repetition of short duration (325 mu s) and high power flashes emitted by xenon lamps. These flashlamps radiate a broadband emission light (approx. 200-1000 nm) with a considerable amount of light in the short-wave UV spectrum. In the present work, this technology was tested as a new tool for the degradation of the herbicide atrazine in water. To evaluate the presence and evolution with time of this herbicide, as well as the formation of derivatives, liquid chromatography-mass spectrometry (electrospray ionization) ion trap operating in positive mode was used. The degradation process followed first-order kinetics.Fluences about1.8-2.3 J/cm(2) induced 50\% reduction of atrazine concentration independently of its initial concentration in the range 1-1000 mu g/L. Remaining concentrations of atrazine, below the current legal limit for pesticides, were achieved in a short period of time. While atrazine was degraded, no chlorinated photoproducts were formed and ten dehalogenated derivatives were detected. The molecular structures for some of these derivatives could be suggested, being hydroxyatrazine the main photoproduct identified. The different formation profiles of photoproducts suggested that the degradation pathway may include several successive and competitive steps, with subsequent degradation processes taking part from the already formed degradation products. According to the degradation efficiency, the short treatment time and the lack of chloroderivatives, this new technology could be considered as an alternative for water treatment. (C) 2011 Elsevier Ltd. All rights reserved.
Issue Date: 2012
Type: Article
Language: English
DOI: 10.1016/j.watres.2011.11.034
ISSN: 0043-1354
Funder: Department of Agriculture, Fisheries and Food from the Basque Government
Appears in Publication types:Artículos científicos

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