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Pavement sealcoat products contain high concentrations of unsubstituted polycyclic aromatic hydrocarbons (PAHs), but the assessment of the potential toxicological impact is limited without the inclusion of PAH derivatives. This study determined the concentrations of 23 unsubstituted PAHs, 11 high molecular weight PAHs (MW302-PAHs), and 56 PAH derivatives, including 10 methyl-PAHs (MPAHs), 10 heterocyclic PAHs (Hetero-PAHs), 26 nitrated PAHs (NPAHs), and 10 oxygenated PAHs (OPAHs) in coal tar- and asphalt-based sealcoat products and time point scrapes. Inclusion of MW302-PAHs resulted in an increase of 4.1%–38.7% in calculated benzo[a]pyrene carcinogenic equivalent (B[a]Peq) concentrations for the coal tar-based products. Increases in some NPAH and OPAH concentrations were measured after application, suggesting the possibility of photochemical transformation of unsubstituted PAHs. The Ames assay indicated that the asphalt-based product was not mutagenic, but the coal tar-based sealcoat products were. The z...

Identification and Toxicological Evaluation of Unsubstituted PAHs and Novel PAH Derivatives in Pavement Sealcoat Products