Fate of Arenes Incorporated with Airborne Soot

Abstract

The chemical modification of airborne arenes under fluorescent irradiation was studied. Smoke as an experimental source of arenes was diluted, then irradiated in a 22-foot dynamic flow chamber. Samples were collected before and after irradiation and determinations of concentrations of two arenes, benz(a)pyrene and perylene, and particle sizes were made. Irradiation caused partial modification or disappearance of the arenes by 35 to 65% of the original content. Without irradiation an apparent increase of arenes was noted; however, this was thought to be a function of the system and particle-size factors. The presence of oxygen increases the degree but is not necessary for the modification of arenes.