title: Photobleaching of lignin derived compounds from pulp mill effluents upon irradiation: the key role of receiving waters.
abstract: Lignin derived macromolecular compounds are the main constituents responsible for the hazardous effects of discharged effluents from the pulp and paper industry in receiving waters. It was shown by ultraviolet-visible (UV-vis) and fluorescence spectroscopies that a selective photodegradation of these structures occurred upon irradiation of fulvic acids (FA) from a kraft pulp mill effluent. Though photodegradation was not remarkably affected by the presence of the natural photosensitizer nitrate, it was inhibited under the presence of chloride. These results indicate that the fate of macromolecular organic matter from kraft pulp mill effluents may be different depending on the type of receiving waters, having a higher persistence when effluents are discharged in estuarine or marine waters than when they are discharged in fresh water.
authors.affiliation: CESAM (Centro de Estudos do Ambiente e do Mar), Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; Department of Applied Chemistry and Physics, University of León, Campus de Vegazana, 24071 León, Spain.
authors.forename: Marta
authors.initials: M
authors.lastname: Otero
authors.forename: Isabela
authors.initials: I
authors.lastname: Guilherme
authors.forename: Eduarda B H
authors.initials: EB
authors.lastname: Santos
mesh_terms: D001578:Benzopyrans / Q000737:chemistry; D007220:Industrial Waste; D008031:Lignin / Q000737:chemistry*; D010209:Paper; D038761:Photobleaching; D010782:Photolysis; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D001578:Benzopyrans; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D008031:Lignin; C005023:fulvic acid
keywords: Chloride; Fulvic acids; Nitrate; Photodegradation; Pulp mill effluents