Photochemical Transformation of 1-Nitropyrene Sorbed on Coal Fly Ash Fractions

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Abstract
1-Nitropyrene was deposited from the vapor phase onto the 45–74 μm size fraction of a coal fly ash, and onto fractions of that ash enriched in ferromagnetic, carbonaceous, and mineral content. The susceptibility of adsorbed 1-nitropyrene to photochemical transformation was compared with that of the parent PAH, pyrene. No detectable photodecomposition of 1-nitropyrene sorbed on the unfractionated fly ash or the carbonaceous fraction was detected upon exposure for 24 hr to radiation from a xenon arc lamp. Slight phototransformation of 1-nitropyrene associated with the ferromagnetic mineral fraction was observed; more extensive photolysis occurred for 1-nitropyrene sorbed on the nonmagnetic mineral fraction. Based on these observations, we infer that photochemical transformation is unlikely to represent an important removal mechanism for 1-nitropyrene associated with carbonaceous particles in the atmosphere.