title: Photodegradation of chlorinated pesticides dispersed on sand.
abstract: The photochemical behaviour of several chlorinated pesticides, namely 4-chloro-2-methylphenoxyacetic acid (MCPA), dichlorophen (DCPH), flamprop-methyl (FPM) and vinclozolin (VCZ) is studied on various kinds of sand: Fontainebleau sand (almost pure silica), Touggourt sand (coloured sand from Sahara) and Jijel sand (dark marine sand). The photodegradation of MCPA is more rapid on Fontainebleau sand than on the two others, because the former is almost colourless pure silica and the others adsorb on the internal surface of the reactor. The degradation rate decreases in the order MCPA, DCPH, FPM, VCZ. The main products identified are 4-chloro-2-methylphenol with MCPA and reduction product with DCPH.
authors.affiliation: Laboratoire des Sciences et Technologies de l'Environnement, Université Mentouri, 25000 Constantine, Algeria. azertal@hotmail.com
authors.forename: Abdennour
authors.initials: A
authors.lastname: Zertal
authors.forename: Michel
authors.initials: M
authors.lastname: Jacquet
authors.forename: Bernadette
authors.initials: B
authors.lastname: Lavédrine
authors.forename: Tahar
authors.initials: T
authors.lastname: Sehili
mesh_terms: D008401:Gas Chromatography-Mass Spectrometry; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry*; D008027:Light; D008855:Microscopy, Electron, Scanning; D010575:Pesticides / Q000737:chemistry*; D010777:Photochemistry / Q000295:instrumentation / Q000379:methods; D010782:Photolysis; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D012822:Silicon Dioxide