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

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• 作者：Ivan A. Titaley ; Anna Chlebowski ; Lisa Truong ; Robert L. Tanguay ; Staci L. Massey Simonich
• 刊名：Environmental Science & Technology Letters
• 出版年：2016
• 出版时间：June 14, 2016
• 年：2016
• 卷：3
• 期：6
• 页码：234-242
• 全文大小：520K
• 年卷期：0

文摘

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]P_eq) 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 zebrafish developmental toxicity tests suggested that fractions where NPAHs and OPAHs eluted have the most significant adverse effects.