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

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. Di...

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Bibliographic Details
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
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Summary: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.
ISSN:0013-936X
1520-5851
DOI:10.1021/es049192e