title: Photolysis of 2,4-dinitrotoluene in various water solutions: effect of dissolved species.
abstract: This work investigates the photolysis of 2,4-dinitrotoluene (2,4-DNT) in the presence of different dissolved species. Initial experiments revealed that the direct photolysis of 2,4-DNT in deionized water solutions under sunlight and artificial light followed a pseudo-first order kinetic. Humic acids (HA) appeared to act as sensitizers in the aqueous photolysis of 2,4-DNT and the calculated half life was found to be approximately 2h, which is faster than the half life calculated in the case of deionized water ( approximately 4h). The presence of salt (NaCl) in the deionized water solutions was found to have a more pronounced sensitizing effect upon the photolysis of 2,4-DNT, yielding half lives of the order of 1h. Investigations on seawater and groundwater spiked with 2,4-DNT, revealed that photolysis is enhanced in the order seawater > groundwater approximately deionized water.
authors.affiliation: Department of Environmental Engineering, Technical University of Crete, Polytechneioupolis, GR73100 Chania, Greece.
authors.forename: Orestis
authors.initials: O
authors.lastname: Mihas
authors.forename: Nicolas
authors.initials: N
authors.lastname: Kalogerakis
authors.forename: Elefteria
authors.initials: E
authors.lastname: Psillakis
mesh_terms: D004136:Dinitrobenzenes / Q000737:chemistry* / Q000528:radiation effects*; D005618:Fresh Water; D006812:Humic Substances; D010782:Photolysis; D012623:Seawater; D012965:Sodium Chloride / Q000737:chemistry*; D012995:Solubility; D012996:Solutions; D013472:Sunlight; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects*
chemical_list: D004136:Dinitrobenzenes; D006812:Humic Substances; D012996:Solutions; D014874:Water Pollutants, Chemical; D012965:Sodium Chloride; C016403:2,4-dinitrotoluene