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首页> 外文期刊>Environmental Science & Technology >Response to Comment on 'PAH Concentrations in Lake Sediment Decline Following Ban on Coal-Tar-Based Pavement Sealants in Austin, Texas'
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Response to Comment on 'PAH Concentrations in Lake Sediment Decline Following Ban on Coal-Tar-Based Pavement Sealants in Austin, Texas'

机译：对“得克萨斯州奥斯汀禁止以煤焦油为基础的路面密封胶之后，沉积物中的PAH浓度下降的评论”的回应

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摘要

We welcome the opportunity to respond to the comment by DeMott and Gauthier, which was funded by the Pavement Coatings Technology Council, on our recent article. We reported that, following a 2006 ban on coal-tar-based pavement sealant (CT sealant) in Austin, Texas, the sum of the 16 Priority Pollutant PAHs (∑PAH) in sediment in Lady Bird Lake, the principal receiving water body for Austin runoff, declined 58%. CT sealant, a black liquid that is sprayed or painted on asphalt pavement, typically is 15-35% by weight coal tar or coal-tar pitch, which are known human carcinogens. CT sealants have an average ∑PAH concentration of about 66 000 mg kg~(-1), 100s to 1000s of times greater than concentrations in other common PAH sources such as used motor oil, tire particles, and weathered asphalt. Declining concentrations of PAHs in Lady Bird Lake sediment are consistent with earlier estimates, based on PAH profiles, that about 77% of PAHs in the lake sediment were from CT sealant. In addition to the trend testing, the subject publication provides a quantitative evaluation of PAH sources by using both statistical analyses of similarity in PAH profiles and the Contaminant Mass Balance source-apportionment model, and discusses other potential PAH contributors in detail. DeMott and Gauthier write that PAH profiles in Lady Bird Lake sediments "are more consistent with typical parking lot/ street dust profiles than CT sealer profiles" and contend that PAHs in dust and scrapings from CT-sealed pavement are from a mixture of various urban sources. This disregards the orders-of-magnitude differences between PAH concentrations in dust from unsealed parking lots and in dust and scrapings from CT-sealed lots. Samples in the CT-sealant dust profile for six cities, for example, had a mean total PAH (sum of 12 PAHs) of 2200 mg kg~(-1), 81 times greater than the mean of samples from unsealed lots (27 mg kg~(-1)) in the same cities, indicating that about 99% of the PAHs in dust from the CT-sealed lots was from CT sealant, precluding any appreciable contribution to the CT-sealant profile from other urban PAH sources.
机译：我们欢迎有机会回应由路面涂料技术委员会资助的DeMott和Gauthier的评论。我们报告说，自2006年在德克萨斯州奥斯汀禁止使用煤焦油的路面密封胶（CT密封胶）后，伯德夫人湖（沉积物的主要接收水体）中沉积物中的16种优先污染物PAHs（∑PAH）之和奥斯丁的径流下降了58％。 CT密封胶是一种喷涂或涂在沥青路面上的黑色液体，通常含量为15-35％重量的煤焦油或煤焦油沥青，这是已知的人类致癌物。 CT密封胶的平均∑PAH浓度约为66 000 mg kg〜（-1），是其他常见PAH来源（例如用过的机油，轮胎颗粒和风化沥青）中浓度的100s至1000s倍。瓢虫湖沉积物中PAHs浓度的下降与早期基于PAH分布的估计值一致，即湖泊沉积物中约77％的PAHs来自CT密封胶。除趋势测试外，该主题出版物还通过使用PAH配置文件相似性的统计分析和污染物质量平衡来源分配模型对PAH来源进行了定量评估，并详细讨论了其他潜在的PAH贡献者。 DeMott和Gauthier写道，瓢虫湖沉积物中的PAH轮廓“比CT密封胶轮廓更符合典型的停车场/街道粉尘轮廓”，并认为CT密封路面的粉尘和碎屑中的PAH来自多种城市来源。这忽略了未密封停车场的粉尘与CT密封批次的粉尘和碎屑中PAH浓度之间的数量级差异。例如，六个城市的CT密封剂粉尘剖面中的样品的平均总PAH（总和为12 PAHs）为2200 mg kg〜（-1），比未密封批次的平均PAH（27 mg）高81倍。 kg〜（-1）），表明CT密封批次粉尘中的PAH约有99％来自CT密封胶，不包括其他城市PAH来源对CT密封胶特性的任何显着贡献。

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  • 来源
    《Environmental Science & Technology》 |2014年第23期|14063-14064|共2页
  • 作者

    Peter C. Van Metre; Barbara J. Mahler;

  • 作者单位

    U.S. Geological Survey, 1505 Ferguson Lane, Austin, Texas 78754, United States;

    U.S. Geological Survey, 1505 Ferguson Lane, Austin, Texas 78754, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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