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Five polycyclic aromatic hydrocarbons (benzo[a]pyrene, pyrene, anthracene, fluoranthene, and phenanthrene) have been adsorbed, from the vapor phase, onto coal fly ash, and the susceptibility of each of the adsorbed compounds to photodecomposition has been studied. Benzo[a]pyrene, pyrene, and anthracene all photolyze efficiently in liquid solution but are highly resistant to photodegradation when adsorbed on fly ash. However, benzo[a]pyrene and anthracene photo-1094 Environmental Science & Technology

Polycyclic aromatic hydrocarbons adsorbed onto coal fly ash were found to be stabilized against photochemical decomposition. However, a number of adsorbed polycyclic aromatic hydrocarbons will spontaneously oxidize in the absence of light, with those compounds containing a benzylic carbon being particularly susceptible. The decomposition rate appears to be fly ash-dependent.

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