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The formation of the benzo[ a ]pyrene (B[ a ]P) diones (B[ a ]P-1,6-dione, B[ a ]P-3,6-dione, B[ a ]P-6,12-dione) as the main products of oxidative degradation of B[ a ]P has been observed under atmospheric conditions in air particulate matter. Samples were collected at two different sites in Munich, Germany. Total B[ a ]P dione concentrations were determined by APCI/LC−MS and ranged between 8 and 605 pg m - 3 . The formation of the direct mutagen B[ a ]P-epoxide was not observed. B[ a ]P dione concentrations did not correspond with B[ a ]P and total carbon concentrations, but showed a correlation with solar irradiation. B[ a ]P dione concentrations were higher on daytime filters compared to filters collected during the night. Lower concentrations of B[ a ]P diones were observed at the site with higher traffic contributions, suggesting a major role of atmospheric transport. Rapid, high-volume sampling indicates that the B[ a ]P dione formation is not dependent on B[ a ]P concentrations, but on photochemical conditions.
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Koeber et al. (1999) studied this question.
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