Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
Environ Sci Technol. 2010 Feb 15;44(4):1217-23. doi: 10.1021/es902657h.
Carbonaceous material (CM) particles are the principal vectors transporting polycyclic aromatic hydrocarbons (PAHs) into urban waters via runoff; however, characteristics of CM particles in urban watersheds and their relative contributions to PAH contamination remain unclear. Our objectives were to identify the sources and distribution of CM particles in an urban watershed and to determine the types of CMs that were the dominant sources of PAHs in the lake and stream sediments. Samples of soils, parking lot and street dust, and streambed and lake sediment were collected from the Lake Como watershed in Fort Worth, Texas. Characteristics of CM particles determined by organic petrography and a significant correlation between PAH concentrations and organic carbon in coal tar, asphalt, and soot indicate that these three CM particle types are the major sources and carriers of PAHs in the watershed. Estimates of the distribution of PAHs in CM particles indicate that coal-tar pitch, used in some pavement sealcoats, is a dominant source of PAHs in the watershed, and contributes as much as 99% of the PAHs in sealed parking lot dust, 92% in unsealed parking lot dust, 88% in commercial area soil, 71% in streambed sediment, and 84% in surficial lake sediment.
碳质颗粒是通过径流将多环芳烃（PAHs）带入城市水域的主要载体；然而，城市流域中碳质颗粒的特征及其对 PAH 污染的相对贡献仍不清楚。我们的目标是确定城市流域中碳质颗粒的来源和分布，并确定在湖泊和溪流沉积物中 PAHs 的主要来源类型的碳质颗粒。从德克萨斯州沃思堡的科莫湖流域采集了土壤、停车场和街道灰尘以及河床和湖泊沉积物样本。有机岩相学确定的碳质颗粒特征以及煤焦油、沥青和烟尘中 PAH 浓度与有机碳之间的显著相关性表明，这三种碳质颗粒类型是流域中 PAHs 的主要来源和载体。对碳质颗粒中 PAHs 分布的估算表明，用于某些路面密封剂的煤焦油沥青是流域中 PAHs 的主要来源，在密封停车场灰尘中占 PAHs 的 99%，在未密封停车场灰尘中占 92%，在商业区土壤中占 88%，在河床沉积物中占 71%，在表层湖泊沉积物中占 84%。
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