Photochemical Transformations of Benzo[e]pyrene in Solution and Adsorbed on Silica Gel and Alumina Surfaces

• Published in: Environmental science & technology 2005-05, Vol.39 (10), p.3646-3655
• Main Authors: Fioressi, Silvina, Arce, Rafael
• Format: Article
• Language: English
• Subjects: Acetonitriles; Adsorption; Alumina; Aluminum Oxide - chemistry; Applied sciences; Atmospheric pollution; Benzopyrenes - chemistry; Benzopyrenes - radiation effects; Exact sciences and technology; Hexanes; Light; Mercury; Molecular Structure; Photodegradation; Photolysis; Pollutants physicochemistry study: properties, effects, reactions, transport and distribution; Pollution; Polycyclic aromatic hydrocarbons; Porosity; Silica; Silica Gel; Silicon Dioxide - chemistry; Solution chemistry; Solutions
• ISSN: 0013-936X; 1520-5851
• DOI: 10.1021/es049192e

The photodegradation of benzo[e]pyrene (BeP), a ubiquitous polycyclic aromatic hydrocarbon (PAH) contaminant, was investigated in solution and adsorbed on surfaces modeling the atmospheric particulate matter to provide fundamental information that could help to clarify its fate in the atmosphere. Diones, diols, and hydroxy derivatives were identified as the major photoproducts of BeP irradiated under simulated atmospheric conditions. The relative distribution of the products and the photodegradation rates of BeP were affected by the average pore size of the surface. Major photoproducts characterized in samples adsorbed on silica gel and alumina surfaces were not observed in irradiated solutions of BeP in hexane. In acetonitrile, the photodegradation rate was faster than in hexane, and one of the diones was observed. Different photoreaction pathways seem to take place in polar versus nonpolar microenvironments.